RE: Prop on a car engine    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: Prop on a car engine
Page: <<   < prev  1 [2] 3   next >   >>  

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
RE: Prop on a car engine - 1/31/2012 10:52 PM   
yakfish



Posts: 2429
Score: 426
Joined: 2/16/2008
Last Login: 5/21/2013
From: Fairborn, OH, USA
Status: offline
quote:

ORIGINAL: ThumbSkull

BTW, for racing, the engine with the most power is not usually the winner.
The one with the best chassis setup and driving skill usually is.
That's where I'd spend the R&D time.



I realize that, but I am not a racer. Isn't geting the most out of your engie part of having a good setup? I just like to know what my engines are cabale of. But if you are a racer wouldn't you like to be able to match the load your buggy or truggy put on an engine then be able to try different setup to see how your engines respond? with a setup like this I will be able to test different pipes and fuels ect. to see what give the engine its best performance. I'm not a racer but if I was this would be a great tool to help me with my setup.

quote:

ORIGINAL: airraptor

You will still not gain anything buy running props on the engines then compairing them to each other. Some have different porting, carb sizes and so on. one with high timing but low transfers may turn a prop the best but suck on the top end and vise versa.

The work has already been done for you. just look at see what the local car guys are running in their fast cars and then get that engine.

Also if you are going to run a prop then you will need add more oil to regular car fuel which is in the 10-14% range for revabilty. props are more of a steady stae running which regular car oil will not be enough.

but again your stuff have fun and good luck.


Right now I know how many rpm's my engines turn in a my MBX5T with stock gearing(Werks B6 does 38250 RPM) for example.once I get it all set up I will be able to get a prop to match those RPM numbers and then i can use that same setuo on different engnes and see how they compare. then I can use a larger prop to put evn more load to estimate which of the engines has more torque.

As far as fuel that is part of the reason for doing this. I mix my own and I can play with different mixtures to see which one perform the best.

Hide Signatures

(in reply to ThumbSkull)
       Post #: 26

RE: Prop on a car engine - 1/31/2012 11:08 PM   
Kmot



Posts: 10743
Score: 168
Joined: 6/11/2003
Last Login: 5/24/2013
From: Northridge, CA, USA
Status: offline 		Check it:

http://www.hudy.net/xhudy/products/proddesc.php?prod_id=289&kategoria=0

_____________________________

~Tom~

Hide Signatures

(in reply to yakfish)
       Post #: 27

RE: Prop on a car engine - 1/31/2012 11:14 PM   
Kmot



Posts: 10743
Score: 168
Joined: 6/11/2003
Last Login: 5/24/2013
From: Northridge, CA, USA
Status: offline 		Check this one too:

http://www.rcplanet.com/RD_Logics_Engine_Stand_p/rdl15000.htm

_____________________________

~Tom~

Hide Signatures

(in reply to Kmot)
       Post #: 28

RE: Prop on a car engine - 1/31/2012 11:18 PM   
yakfish



Posts: 2429
Score: 426
Joined: 2/16/2008
Last Login: 5/21/2013
From: Fairborn, OH, USA
Status: offline 		I have seen those. I think I am going to build my own. here are a cople pics of what I am planning to build. Everything is just setting there, nothing is bolted down yet. I am still missing a few small peices but I already have most of what I will need already. The nice thing about a setup like this is that I will be able to use a bump box to start the engine and the prop won't have tp spin at the same speed as the engine. What do you all think?





Hide Signatures

(in reply to Kmot)
       Post #: 29

RE: Prop on a car engine - 2/1/2012 8:45 AM   
asmund


 

Posts: 2824
Score: 111
Joined: 11/20/2005
Last Login: 5/24/2013
From: Floroe, NORWAY
Status: offline 		Seems like alot of work for nothing. I can`t see how this is going to help you to choose a spesific engine for a spesific car or track, but as long as its just for fun..........

It would be quicker and easier to bolt in a few different engines in the car and actually drive them to compare them, that`s what I do

Hide Signatures

(in reply to yakfish)
       Post #: 30

RE: Prop on a car engine - 2/1/2012 10:23 AM   
jaka


 

Posts: 7183
Score: 158
Joined: 12/11/2001
Last Login: 5/24/2013
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
Agree!

_____________________________

Jan Karlsson - Supplier MVVS Products

Hide Signatures

(in reply to asmund)
       Post #: 31

RE: Prop on a car engine - 2/1/2012 10:36 AM   
HWM77


 

Posts: 69
Score: 100
Joined: 6/12/2010
Last Login: 5/23/2013
From: coffs harbourn.s.w, AUSTRALIA
Status: offline 		Hi jaka
            I need some piston/liners for m.v,vs 15 diesel can you help,thanks

Hide Signatures

(in reply to jaka)
       Post #: 32

RE: Prop on a car engine - 2/1/2012 11:37 AM   
1QwkSport2.5r



Posts: 3741
Score: 155
Joined: 10/15/2006
Last Login: 5/24/2013
From: Cottage Grove, MN, USA
Status: offline
quote:

ORIGINAL: HWM77

Hi jaka
            I need some piston/liners for m.v,vs 15 diesel can you help,thanks

Private messaging exists so threads don't need to be hijacked for stuff like this. Just FYI.

_____________________________

*Real* glow fuel is made with Methanol, Nitromethane, and Castor oil.

Hide Signatures

(in reply to HWM77)
       Post #: 33

RE: Prop on a car engine - 2/1/2012 11:49 AM   
HWM77


 

Posts: 69
Score: 100
Joined: 6/12/2010
Last Login: 5/23/2013
From: coffs harbourn.s.w, AUSTRALIA
Status: offline 		JUST ASKED A QUESTION  ARE YOU FOR REAL  GET A LIFE

Hide Signatures

(in reply to 1QwkSport2.5r)
       Post #: 34

RE: Prop on a car engine - 2/1/2012 3:34 PM   
rgburrill



Posts: 677
Score: 126
Joined: 12/31/2010
Last Login: 5/23/2013
From: Trumbull, CT, USA
Status: offline 		I don't get it.  Changing carbs, adding flywheels, changing heads?  How does this provide any comparison between engines?  Why not just get an older car/truck/buggy, put your test engines in it and run the heck out of them?

Hide Signatures

(in reply to acdii)
       Post #: 35

RE: Prop on a car engine - 2/1/2012 5:40 PM   
1QwkSport2.5r



Posts: 3741
Score: 155
Joined: 10/15/2006
Last Login: 5/24/2013
From: Cottage Grove, MN, USA
Status: offline
quote:

ORIGINAL: HWM77

JUST ASKED A QUESTION  ARE YOU FOR REAL  GET A LIFE

Your post has nothing to do with the subject of the thread, sorry if I ticked you off.


_____________________________

*Real* glow fuel is made with Methanol, Nitromethane, and Castor oil.

Hide Signatures

(in reply to HWM77)
       Post #: 36

RE: Prop on a car engine - 2/1/2012 5:43 PM   
1QwkSport2.5r



Posts: 3741
Score: 155
Joined: 10/15/2006
Last Login: 5/24/2013
From: Cottage Grove, MN, USA
Status: offline
quote:

ORIGINAL: rgburrill

I don't get it.  Changing carbs, adding flywheels, changing heads?  How does this provide any comparison between engines?  Why not just get an older car/truck/buggy, put your test engines in it and run the heck out of them?

I personally would want to simply break the engine in, only because I don't think a car engine gets to its peak during break in and it should, IMO.

I can see the reasoning behind what the OP wants to accomplish. It's no different than testing a certain prop on more than one engine to suit a specific aircraft.

_____________________________

*Real* glow fuel is made with Methanol, Nitromethane, and Castor oil.

Hide Signatures

(in reply to rgburrill)
       Post #: 37

RE: Prop on a car engine - 2/1/2012 6:21 PM   
yakfish



Posts: 2429
Score: 426
Joined: 2/16/2008
Last Login: 5/21/2013
From: Fairborn, OH, USA
Status: offline
quote:

ORIGINAL: rgburrill

I don't get it.  Changing carbs, adding flywheels, changing heads?  How does this provide any comparison between engines?  Why not just get an older car/truck/buggy, put your test engines in it and run the heck out of them?


I do that too! But with this I can put the exact same load on different engines so comparison testing can be consistant. In a car/truck it wold be very difficult to reproduce the exact same amount of load from one engine to the next. so this would provide consistancy. Also I am will be able to compare the performance of one engine running different fuel, different pipes ect. or I could compare multiple engine running the same fuel or the same pipe to see how each of them perform. But this would provide consistancy for my tests.

If I could figure out a way to calculate actual real world power that would be awesome. All of the engine companies just put whatever performance number they want to on an engine. You never can really KNOW how much horse power or RPMs an engine is capable of by reading their marketing material. There is no standard by which they adhere to which makes comparing manufactures specs usless.

Hide Signatures

(in reply to rgburrill)
       Post #: 38

RE: Prop on a car engine - 2/1/2012 7:34 PM   
rgburrill



Posts: 677
Score: 126
Joined: 12/31/2010
Last Login: 5/23/2013
From: Trumbull, CT, USA
Status: offline
quote:

ORIGINAL: 1QwkSport2.5r


quote:

ORIGINAL: rgburrill

I don't get it.  Changing carbs, adding flywheels, changing heads?  How does this provide any comparison between engines?  Why not just get an older car/truck/buggy, put your test engines in it and run the heck out of them?

I personally would want to simply break the engine in, only because I don't think a car engine gets to its peak during break in and it should, IMO.

I can see the reasoning behind what the OP wants to accomplish. It's no different than testing a certain prop on more than one engine to suit a specific aircraft.


But testing a prop on various engines doesn't mean tearing the engines apart and changing heads and carbs.  Break-in simply means running at less than full-out to start.  It used to be that you would break-in a full size car with break-in oil and keeping under certain speeds for 500 miles or so.

Hide Signatures

(in reply to 1QwkSport2.5r)
       Post #: 39

RE: Prop on a car engine - 2/1/2012 7:35 PM   
rgburrill



Posts: 677
Score: 126
Joined: 12/31/2010
Last Login: 5/23/2013
From: Trumbull, CT, USA
Status: offline 		Yakfish, how can you seriously say that you are comparing different engines when you change out two of the most critcal parts of the engine?

Hide Signatures

(in reply to yakfish)
       Post #: 40

RE: Prop on a car engine - 2/1/2012 7:38 PM   
rgburrill



Posts: 677
Score: 126
Joined: 12/31/2010
Last Login: 5/23/2013
From: Trumbull, CT, USA
Status: offline 		I am not a car person - thus my questions.  But when I want to test out various airplane engines I put them on one plane and fly them.  Same for breaking in - i use a trainer.  I don't see how it is much different for car engines.

Hide Signatures

(in reply to rgburrill)
       Post #: 41

RE: Prop on a car engine - 2/1/2012 8:09 PM   
earlwb


 

Posts: 4561
Score: 584
Joined: 8/6/2009
Last Login: 5/24/2013
From: Grapevine, TX, USA
Status: offline 		Well I like to bench run a engine for a little while to dial in the carb some. It can be a lot easier that way, than trying to do it in a car at first.
But I have run them in cars too, so it could go either way. Years ago when i was a lot more interested in cars we used to have to run them in the cars as at the time we couldn't put a prop on them. But sometimes it was a pain getting a cantankerous  engine to run and dial it in too.



_____________________________

Club Saito #722, Sig Kadet Brotherhood #80
AMA # 928076

Hide Signatures

(in reply to rgburrill)
       Post #: 42

RE: Prop on a car engine - 2/1/2012 9:10 PM   
vertical grimmace



Posts: 4407
Score: 154
Joined: 3/13/2004
Last Login: 5/24/2013
From: ft collins , CO, USA
Status: offline 		I can promise you that unless you use a very small prop, getting over 28,000 rpm will be almost impossible with a prop. I am more interested in this as I think it would be awesome to convert a small car engine to fly a plane. Using a prop to break in your engines does have a lot of merit though and it seems you could get the needles set very easily if you could match the load experienced in your car.

_____________________________

"let''''s just say, they will be satisfied with less" Ming the Merciless

Hide Signatures

(in reply to acdii)
       Post #: 43

RE: Prop on a car engine - 2/1/2012 10:05 PM   
asmund


 

Posts: 2824
Score: 111
Joined: 11/20/2005
Last Login: 5/24/2013
From: Floroe, NORWAY
Status: offline 		Bact to the original post, that Master Airscrew prop at typical buggy-engine rpm`s is sure to explode and hurt/kill someone. Get one of those break-in rigs myself and others have linked to and be done with it, those fans can take the rpm`s unlike the typical plane prop you intend to use

A prop throwing a blade at very high rpm`s is no joke!

Hide Signatures

(in reply to vertical grimmace)
       Post #: 44

RE: Prop on a car engine - 2/1/2012 11:26 PM   
fly24-7



Posts: 264
Score: 119
Joined: 12/18/2005
Last Login: 5/21/2013
From: North Aurora, IL, USA
Status: offline 		I know it's been previously stated but I'll reinforce the thought - Using an R/C airplane prop is not a good idea. I suspect that very few props can handle the forces from being spun at such high speeds. I'd check with the prop manufacturer for their speed recommendations before trying anything. You risk damaging the engine, the prop, YOURSELF and anyone/anything else in range of getting hit by shrapnel when your set-up goes KABOOM...

_____________________________

Never underestimate the importance of altitude...

Hide Signatures

(in reply to acdii)
       Post #: 45

RE: Prop on a car engine - 2/1/2012 11:40 PM   
yakfish



Posts: 2429
Score: 426
Joined: 2/16/2008
Last Login: 5/21/2013
From: Fairborn, OH, USA
Status: offline 		I don't have to worry about a prop doing 40,000 rpm. do the math. I am using a clutch, clutchbell and a spur gear. the spur gear is 43t and the clutch bell wil be 18t. that means the prop will be doing 16744 RPM when the engine is doing 40,000. I will be using a prop that will match the load of my MBX5T truggy. at WOT the engine in the truggy has been doing 39,000.

Hide Signatures

(in reply to fly24-7)
       Post #: 46

RE: Prop on a car engine - 2/2/2012 12:45 AM   
airraptor


 

Posts: 2675
Score: 130
Joined: 1/26/2004
Last Login: 5/24/2013
From: fairfield, CA, USA
Status: offline 		Guys we gave advice and he doesnt want to take our advice.

i think that if you can measure your rpm in the buggy then you have a good set up already. see what rpm you get at the end of the straight of just before a jump amd then try another engine to see if it reaches that same rpm or better.

also if your engine already is hitting 39,000 i think you need to regear some to better use the power of the engine. i would think most of these car engines ,ake thier best power in the 20,000-28,000 rpm range.

Good luck!

_____________________________

AMA # 186123
I dont always fly inverted, but when I do, I do it down low.

Hide Signatures

(in reply to yakfish)
       Post #: 47

RE: Prop on a car engine - 2/2/2012 1:24 AM   
1QwkSport2.5r



Posts: 3741
Score: 155
Joined: 10/15/2006
Last Login: 5/24/2013
From: Cottage Grove, MN, USA
Status: offline
quote:

ORIGINAL: airraptor

Guys we gave advice and he doesnt want to take our advice.

i think that if you can measure your rpm in the buggy then you have a good set up already. see what rpm you get at the end of the straight of just before a jump amd then try another engine to see if it reaches that same rpm or better.

also if your engine already is hitting 39,000 i think you need to regear some to better use the power of the engine. i would think most of these car engines ,ake thier best power in the 20,000-28,000 rpm range.

Good luck!

Most car engines are ported for that rpm. Most of the car engines I own currently have at least 175° of exhaust duration and average 17-19° blowdown timing. The highest timed engine I have runs 186° Exhaust and 19° blowdown. The crank timing varies significantly, but thats no different than airplane engines. I haven't seen any patterns with crank timing as I have with exhaust and blowdown. I have a tach sensor for my Spektrum DX3S radio, but most of the car guys that have this radio have said the Tach isnt accurate anyway so I havent bothered trying it on any of my cars.

As far as the prop choice on a car engine, I would think a Ducted fan prop is going to be the right prop to handle 30k+. Even carbon fibre props which was brought up before may not be robust enough. I would think a 6x4 or 5x6 would be small enough to let the engine turn up but load them enough to keep the conrod from going AWOL.

I like the break-in stand idea better - looks safer and easier at the cost of roughly $140..

_____________________________

*Real* glow fuel is made with Methanol, Nitromethane, and Castor oil.

Hide Signatures

(in reply to airraptor)
       Post #: 48

RE: Prop on a car engine - 2/2/2012 4:14 AM   
Frank Ts Stuff



Posts: 80
Score: 100
Joined: 6/19/2003
Last Login: 5/23/2013
From: LAKELAND, FL, USA
Status: offline 		I think if you check with Fromeco, the TNC tach they offer will work for your testing.

-Sean


_____________________________

Sean Curry
FTE Inc.

Hide Signatures

(in reply to 1QwkSport2.5r)
       Post #: 49

RE: Prop on a car engine - 2/2/2012 4:20 AM   
1QwkSport2.5r



Posts: 3741
Score: 155
Joined: 10/15/2006
Last Login: 5/24/2013
From: Cottage Grove, MN, USA
Status: offline
quote:

ORIGINAL: Frank Ts Stuff

I think if you check with Fromeco, the TNC tach they offer will work for your testing.

-Sean

I envy that tach. Someday, I will own one. Unfortunately, today isnt that day and tomorrow doesnt look good either.. They do have a nice tach though.



_____________________________

*Real* glow fuel is made with Methanol, Nitromethane, and Castor oil.

Hide Signatures

(in reply to Frank Ts Stuff)
       Post #: 50

Page:   <<   < prev  1 [2] 3   next >   >>  
All Forums >> Glow Engines, Gas Engines, Fuel &amp; Mfg Support Forums >> Glow Engines >> RE: Prop on a car engine
Page: <<   < prev  1 [2] 3   next >   >>  




Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


1.094RCU1