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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC 1/8th Scale Buggies >> porting
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porting - 11/20/2005 4:28:40 PM   
ZX1


 

Posts: 133
Joined: 11/2/2005
From: d, MOZAMBIQUE
Status: offline 		HI can anyone help me with porting my sportwerks 26 motor will be my first time thanks
       Post #: 1

RE: porting - 11/21/2005 2:40:57 AM   
MassiveMods



Posts: 1562
Joined: 11/23/2003
From: SydneyNSW, AUSTRALIA
Status: offline 		What do you need to know ? What do you want tout of the engine ?

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       Post #: 2

RE: porting - 11/21/2005 5:37:07 PM   
ZX1


 

Posts: 133
Joined: 11/2/2005
From: d, MOZAMBIQUE
Status: offline 		hi I GOT SAND IN THE CARB AFTER I LOST MY FILTER SO IM GONNA RE DO IT BUT ALSO WANT IT PORTED MORE POWER

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       Post #: 3

RE: porting - 11/21/2005 7:32:19 PM   
plaidfish


 

Posts: 861
Joined: 8/8/2005
From: Pompano Beach, FL, USA
Status: offline 		generally speaking for modding engines, it's easier to get more top end out of a mill that has good bottom end already, but you can't give a real top end mill, more bottom end......so back to the question,
what do you want out of the engine?????
keep in mind once you mod it you can't go back, so take small amounts of metal off each time.....you'll be rebuilding the hell out of that thing for a few days doing tests after your mods too so get a good clean workspce setup.......get a good dremel set and some grind stones and polishing bits and compound...masking tape and black marker are good to use too.......after that you need to open up your in/out ports.......make sure you keep the same bevel on the ports as well........bevel the fuel intake on th ecrank.......the exact amount to open it up is preference so you decide that bit on your own.....this is not an easy thing to do right so if you aren't sure about something STOP!! and ask questions....

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       Post #: 4

RE: porting - 11/21/2005 8:08:16 PM   
SManMTB



Posts: 4934
Joined: 4/28/2005
From: Charlottesville, VA, USA
Status: online 		Changing the timing without knowing what you are doing is a sure way of wasting money.
'Porting' does not mean 'randomly make all ports higher/wider/bigger'.

Good luck.

(in reply to plaidfish)
       Post #: 5

RE: porting - 11/21/2005 9:42:25 PM   
plaidfish


 

Posts: 861
Joined: 8/8/2005
From: Pompano Beach, FL, USA
Status: offline
quote:

ORIGINAL: SManMTB

Changing the timing without knowing what you are doing is a sure way of wasting money.
'Porting' does not mean 'randomly make all ports higher/wider/bigger'.

Good luck.


At some point someone (a hobbiest, not a scientist) did just that to determine what porting made an increase in performance......you are right in saying this is not a carefree easy thing to do but w/o more experience/info on his mill I'm not going to be telling him how much he should take off......
YZ....If you really want to learn the proper way to mod your engine, get a timing wheel.....it will tell you EXACTLY where in the piston stroke your ports are being used.....you can then read more on what each type of mod does to your engine....then using YOUR OWN DECISION you make th emods.......be preparred to waste some money in this learning process as you will innevitably trash a nice mill going too far......
Sman that first line wasn't meant as an attack on you either.....

(in reply to SManMTB)
       Post #: 6

RE: porting - 11/21/2005 9:56:08 PM   
SManMTB



Posts: 4934
Joined: 4/28/2005
From: Charlottesville, VA, USA
Status: online
quote:

ORIGINAL: plaidfish


quote:

ORIGINAL: SManMTB

Changing the timing without knowing what you are doing is a sure way of wasting money.
'Porting' does not mean 'randomly make all ports higher/wider/bigger'.

Good luck.


At some point someone (a hobbiest, not a scientist) did just that to determine what porting made an increase in performance......you are right in saying this is not a carefree easy thing to do but w/o more experience/info on his mill I'm not going to be telling him how much he should take off......
YZ....If you really want to learn the proper way to mod your engine, get a timing wheel.....it will tell you EXACTLY where in the piston stroke your ports are being used.....you can then read more on what each type of mod does to your engine....then using YOUR OWN DECISION you make th emods.......be preparred to waste some money in this learning process as you will innevitably trash a nice mill going too far......
Sman that first line wasn't meant as an attack on you either.....


Non taken but there are people getting a PhD in 2-stroke design who are also in the hobby (boats). Search for Brian Callahan on www.rcboat.com. A wealth of information.

(in reply to plaidfish)
       Post #: 7

RE: porting - 11/21/2005 10:23:26 PM   
ZX1


 

Posts: 133
Joined: 11/2/2005
From: d, MOZAMBIQUE
Status: offline 		THANKS GUYS wow i did not know that porting was so involved i will just re build it and be happy with that i mean i dont even know how to tune up a motor yet let alone trying to port it

(in reply to SManMTB)
       Post #: 8

RE: porting - 11/21/2005 11:07:47 PM   
kx250ryder



Posts: 1387
Joined: 8/23/2005
From: Queen Creek, AZ, USA
Status: offline 		The best analogy I can think of to describe porting, is that you are trying to "build" a river. If you look at the way water flows in a river you can see the similarities.

Assume that you are trying to make a river that flows as fast as you possibly can. You want to eliminate all surface imperfections from your river bed (polishing), this is like the rocks sticking up in the river, which make little eddys, and make the current more turbulent, and slower. You can't make the river too wide, or the water will slow to a stop, but on the other side of that, you can't make it too narrow, or you will restrict the ammount of water that can pass (ignoring the fact that rivers overflow). Also, you must ensure that you do not have any sudden changes in direction, which restrict water flow. Its all a balancing act to make sure that you get a maximum volume of air per piston stroke.

So basically, unless you can control nature and you wear sandals often, stay away from engine porting. Save that for the guys who have motors named after them.

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       Post #: 9

RE: porting - 11/21/2005 11:29:36 PM   
nitro666


 

Posts: 112
Joined: 3/15/2005
From: ottawa, ON, CANADA
Status: offline 		send it in to rb mods( i think does it) for 100$ you get a realyyyyyyyyyyy nice job


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       Post #: 10

RE: porting - 11/22/2005 2:05:15 AM   
MassiveMods



Posts: 1562
Joined: 11/23/2003
From: SydneyNSW, AUSTRALIA
Status: offline 		Cut 1mm off the top of the exhaust port, keep ot the same angle as before and 1.2 mm off the right hand side intake of the crank..

As far as Rb mods goes he is good ! If youre in the US id go to him for sure but if youre ever in OZ look us up !

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       Post #: 11

RE: porting - 11/22/2005 11:08:02 PM   
mayhem272



Posts: 572
Joined: 9/14/2005
From: Pittsburgh, PA, USA
Status: offline 		well my lhs guy knows a guy who does porting for $120
im doin it on my 2.5 jato
he also includes rebuild in that price too
orig hp 1.33
after 2.4
all for $120
he does all engines too

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       Post #: 12

RE: porting - 11/23/2005 12:21:41 AM   
MassiveMods



Posts: 1562
Joined: 11/23/2003
From: SydneyNSW, AUSTRALIA
Status: offline
quote:

ORIGINAL: mayhem272

well my lhs guy knows a guy who does porting for $120
im doin it on my 2.5 jato
he also includes rebuild in that price too
orig hp 1.33
after 2.4
all for $120
he does all engines too



So how does this guy get these figures? over 1 hp from a mod ? Just curious

_____________________________

www.massivemods.com Specialising in Engine Mods, Superior Quality Racing Fuels, Australian Go Engine distributor/developer.

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       Post #: 13

RE: porting - 11/23/2005 1:39:07 AM   
peterman9000


 

Posts: 52
Joined: 6/8/2005
From: , MI, USA
Status: offline 		thats a pretty massive mod

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       Post #: 14

RE: porting - 11/23/2005 4:29:21 AM   
clone3



Posts: 357
Joined: 10/12/2005
From: las vegas, NV, USA
Status: offline 		alot of engines come with head shims--by removing one or more of the head shims you increase compression. another mod would be to mill the head(same as removing shims). You can get some good gains out of a motor in several ways--each way giving you a little more power:

1. Proper tuning
2. head shims
3. porting and polishing
4. crank cutting and balancing
5. upgraded bearings
6. run higher nitro
7. tuned pipe and header



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ON THE GAS!!!

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