Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

best glow plug for TT pro 40

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Old 03-23-2009, 10:17 PM
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MFLOOD3800
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Default best glow plug for TT pro 40

What turns the highest rpm's for a q500 runing a TT Pro 40?
Thx

Ive been running an OS #8 and am thinking of trying a A5 (colder), but the most nitro we can run is 15%.
Im hitting 16,000 with a 8.75X 8.8 APC.
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Old 03-23-2009, 10:51 PM
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Default RE: best glow plug for TT pro 40

you pick your plug based the temp range you plan to operate not the rpm range. there are about 15 variables that affect operating temp that I'm aware of. with higher rpm you would want a more durable plug so say a tower power plug wouldn't suffice. if your limited to 15% stick with what ya got though id recommend a mccoy or rossi med plug
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Old 03-24-2009, 01:12 AM
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tIANci
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Default RE: best glow plug for TT pro 40

I am running a No. 8 on my TT46 at about the same RPM with a 8.75 x 8.8 and 9x7 with 15% nitro, the plug is holding up well. No tuning issues.
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Old 03-24-2009, 07:03 AM
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Default RE: best glow plug for TT pro 40

I go back and forth on the A5 & #8. The McCoy plugs didn't lift my skirt too much and didn't last long either. The #8 seems to have the best life and ease of starting but on race day I haven't really noticed much diffrence.
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Old 03-24-2009, 08:28 AM
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Default RE: best glow plug for TT pro 40

you might go to merlin glowplugs site and have a look at their charts, they are very good , they are the oem supplier for jett engines, and they also own the rights to most of the go fast plug designs . you can buy nelson style plugs from them as well
i have a dozen of their plugs and so far they exceed my expectations, and their charts for crossover are excellent. oh! and the price is right too!
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Old 03-24-2009, 08:32 AM
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Default RE: best glow plug for TT pro 40

I had decided to use the OS #8 for the cooler days here where we race early in the spring. If I had a McCoy MC-8 I would give it a shot as I use the MC-9 on my GR7 and it held up great running 25%. Its more of a cold plug used in higher nitro, higher rpm areas.

I will try the OS# A5 as the temps rise in our summer stretch and travel to warmer venues also. Here I may even try the MC-9 McCoys.
Its a trickey call, because we are running high RPMS, med nitro, smaller engines, yet exposed to the open air. There are several factors all mingled when choosing the right plug. The lines have gotten a little blurred.

I am running long straights so I dont need a plug that starts and stops a lot, but needs to be durable. I felt I had a handle on it, but wanted to hear from the rest of the field what has workerd with them.

Thx to all!!
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Old 03-24-2009, 10:55 AM
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Default RE: best glow plug for TT pro 40

Hi!
The OS 8 plug is not cool enough when running so much nitro.
Use a Rossi 5 or 6 plug
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Old 03-24-2009, 11:04 AM
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Default RE: best glow plug for TT pro 40

RedFox,
I understand the temp range vs the RPMs. I gave the data of high RPMs to allow the information out that I am running a high RPM which creates the higher temp range. If I was at a lower RPM I wouldve listed that, but High RPM's run constantly is to be configured into the plug selection because it effects the temps. I guess I wasnt clear enough on that. Thanks for the input however!!
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Old 03-24-2009, 11:05 AM
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Default RE: best glow plug for TT pro 40

Jaka,
is 15% nitro considered high or medium?
I thought FAI or 5% was low and 20%+ was high and anything in between was medium??
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Old 03-30-2009, 09:32 AM
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Default RE: best glow plug for TT pro 40

Just thought I would share what we discovered in testing.

TT Pro40 ( 10 tanks thru it)
APC 8.8X8.75
Altitude-6000' ambient air temps- 59*
Fuel Magnum 15%
Weight of plane 3.8 lbs
Stock fuel tank - no bladder tank

Started with OS#8 (hot plug) hit 15200 on ground
OS A3 (cold/Med plug) hit 15300 on ground
OS A5 (cold plug) hit 15440 on ground
OS F , four stroke, (coldest plug) hit 15570 on ground

The colder plugs yielded more rpm on ground
I used a radra gun and tried to get accurate readings and if we flew right at the gun it reported 112 MPH into a 5 mph wind.
If we flew a bit too far out it showed 64 MPH so I dont know how accurate it was. The gun is a $300 gun and should be faily accurate, but the planes is quite small to pick up.


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Old 03-30-2009, 09:43 AM
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Clark L
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Default RE: best glow plug for TT pro 40

I think you're way over propped.... try an APC 9x6 sport prop.

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Old 03-30-2009, 09:48 AM
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Default RE: best glow plug for TT pro 40

I used those 9X6's and found my exit speeds were terrible and the rpm would signifcally drop off.
I experimented with a 9X6 and cut it down a bit, and that did help. Most of races are at a lower altitude. We race at half the altitude at one venue.

I will try the 9X6 now that I have a radar gun and compare the speeds. Maybe the drop in the turns arent a big deal if I get a lot more straight speed. We run a 600' 2 pole course.
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Old 03-30-2009, 10:00 AM
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tIANci
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Default RE: best glow plug for TT pro 40

Its really hot and humid here ... we run OS NO. 8 with 15% nitro all the time without a hitch. Would a colder plug give better RPMs?
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Old 03-30-2009, 10:05 AM
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lfinney
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Default RE: best glow plug for TT pro 40

yes always, more rpms =more heat. more heat needs colder plug
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Old 03-30-2009, 10:19 AM
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tIANci
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Default RE: best glow plug for TT pro 40

Okay ... will try to go with a colder plug and see. Usually after a 3 min flight on my Viper then engine is about 180*F when she lands. I can hold the head. That means she is not running all that hot up there. I think I got a cold plug and will test it out tomorrow morning. Thanks!
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Old 03-30-2009, 10:24 AM
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Default RE: best glow plug for TT pro 40

Yes the colder plugs can yield close to 300 more RPMs.

The ambient air temp, air density (depending on alt vs temp) and cooling capabilities of your engine all plays into it. Though it is true the glow plug generally is determined by the heat range of the engine, you must consider high rpms are adding heat, what % of nitro you are using, are you starting and stopping or running long straights, the oil content of your nitro. Many things are factored in.

We only tested the OS plugs, and there is a very good chance other manufacturers may yiled even more. We ran it with the baffle in and with it out (on muffler) and saw less RPM with it out.
Go figure on that??

TT used to use head shims but all the new ones I am seeing no longer use any.
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Old 03-30-2009, 10:48 AM
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Default RE: best glow plug for TT pro 40

Forums are great ...
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Old 03-30-2009, 11:49 AM
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Default RE: best glow plug for TT pro 40

all I use is K&B 1L works great and last a long time

Duane
12V
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Old 03-30-2009, 09:28 PM
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Default RE: best glow plug for TT pro 40

For Team SAM-RAI Racing running TT Pro .40, we prefered the McCoy #59 plug and has been running it for years now. We also used McCoy #9 as a second choice depending on the heat of the day and that works really well too when it's HOT out.

Our new team member, Tom Dooly, he likes K&B 1L and that works great for him also. The McCoy#59 not only works good, but give very good performance with many reliable runs from our experiences. These two plugs are the best we've found and will still keep using it unless something else comes along that's proven to be better. But until then, the McCoy #59 is still the choice to be had. Just a thought!
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Old 03-30-2009, 10:44 PM
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Default RE: best glow plug for TT pro 40

Here in the midwest with large temp changes from morning to afternoon races, I have gotten to where all I use anymore is the standard Fireball plugs. With prices @ $31.00 a dozen with shipping, why use anything else?
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Old 03-30-2009, 11:52 PM
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Default RE: best glow plug for TT pro 40

I just bought a bunch of Fireballs, they are relatively cheap. Tested the one with the idle bar on my TT46 and performance was not as good, I will see how the cooler plugs are against standard plugs like the OS No. 8.
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Old 03-31-2009, 12:12 AM
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Default RE: best glow plug for TT pro 40

You may want to play with the 9x7 or the 9x8 for your 6000' elev,,, may not be enuff pitch with the 9x6 at your elev. You may also want to lose that stock head shim and replace it with the .005 shim from www.pspec.com,,, another suggestion,,, replace that stock tank with a Tetra 4oz bladder tank for Race day,,, the 5 and 6 oz are ok but your just carrying extra fuel for a 10 lap Race. Reason for the bladder tank is for the constant FOAM free-NON contaminated fuel from the exhaust-fuel supply to the engine,,, in other words your getting a fresh fuel supply to the engine all the time.

As for glow plugs,,, Mc Coy #9 is what was used when I was calling for Gale when we set Fast times in the 1.27 range on the long couse at the Basin and Medferd


BV
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Old 03-31-2009, 08:24 AM
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Default RE: best glow plug for TT pro 40

Bill,

I just went thru and balanced a gang of props and am trying hard to see which one with the best diameter/pitch can turn at 15,700 on the ground. I ordered my Jett bubbless and it arrived yesterday. No one else is running them here. I stayed away from using them because of that. But I ran them in the desert and saw great benefits. I will convert mine today, and cause a stir at fuel up area I am sure. It is legal, just no one else doing it yet. Mostly new racers and some old school racers, both not updated with todays stuff. Some guys refuse to switch to 2.4.


I will switch to the diff pitch prop ( 9x7, 9x8) and see. The race is in Mesquite, Nv and the elev there is closer to 2000' I think.
Im after the best 16000 spinning prop I can get while in the air. The temps here are still under 60 and probably closer to mid 70's at Mesquite so the Air/Density will be more favorable to lower altitude props.

By the way the new TT engines I have, dont have any head shims at all. A few years back (4) we just took out the head shim and flew without. Seems TT is doing that for us. We also used to remove the baffle, now we leave it in and see better results.
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Old 03-31-2009, 10:19 AM
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Default RE: best glow plug for TT pro 40

Just picking nits here but the #8 is COLDER than the A3.

[link]http://www.osengines.com/accys/glowplugs.html[/link]
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Old 03-31-2009, 11:05 AM
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Default RE: best glow plug for TT pro 40

Yep thats right: OS puts out their specs indicating that the A3 is a hot plug and the #8 is a Medium to Hot plug. Seemed that that #8 actually runs a lower RPM than the A3. This makes one wonder why they are listed as they are. No matter what the manufacturer displays, the tests dont lie. Of course we couldve waited before running the plugs til the engine cooled back down.
[&o]

Good heads up!
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