R/C Tech Forums - GRP... Engine... Thread...

So my grp .28 i bought with the promo kit has the fast lock system pipe and it just doesnt seem to seal right it feals kinda loose and has felt that way from day one what are you guys doing to seal them up better. i have hardened oil residue al around it from it seaping oil while ive ran my truck help me out.

Those seals leak after they get hard. I saw it 1st hand when the ambient temp was in the 30s I could see the exhaust escaping around the FLS connection. Replace them when they get hard. The Mugen FLS orings work heres a link>>

Mugen FLS orings

sluggo_sx8

06-11-2009 07:29 PM

hey guys what is the normal temp of a GRP tuned with 30% fuel? Mine is pulling like hell and only running like 189F is this normal?

Thanks

zixxer

06-12-2009 03:18 AM

yyeh 2 o-rings

Hate2Looz

06-12-2009 04:14 AM

Quote:

Originally Posted by sluggo_sx8 (Post 5927628)

hey guys what is the normal temp of a GRP tuned with 30% fuel? Mine is pulling like hell and only running like 189F is this normal?

Thanks

Sounds about right. Don't tune this engine by temperature, tune it by sound and smoke. Otherwise, you'll cork it like everyone else did that tried to tune them by temp.

Frank L

06-12-2009 08:49 AM

Quote:

Originally Posted by sluggo_sx8 (Post 5927628)

hey guys what is the normal temp of a GRP tuned with 30% fuel? Mine is pulling like hell and only running like 189F is this normal?

Thanks

There are many variables with these engines but if it is running well and you have good smoke and the run time is in the 9-10 min region then I would say it is perfect. I have had GRP's run as hot as 220-230 in a heavy truggy and then on some days right around 200. I know racers that run their GRP's at 190 all day long and they get 10-12 gallons out of them. Look at the performance and smoke that comes out of the pipe if that is good then dont worry about it.

Integra

06-12-2009 09:51 AM

Quote:

Originally Posted by zixxer (Post 5928615)

yyeh 2 o-rings

really 2 on the FLS header ? just butt them up to eachother ?

sluggo_sx8

06-12-2009 12:35 PM

Quote:

Originally Posted by Frank L (Post 5929358)

sweet thanks guys, I am loving this motor. My axe was still falling on its face rich at 190f and would start to wake up at around 220f.

mattwoodcraft

06-12-2009 01:22 PM

reagrdless what engine it is i would have thought tuning to temps was a bad thing ..i have never owned a temp gun

if it performs well and no lean bogs ect its all good :)

Dave.H

06-12-2009 02:07 PM

What pipe runs the best on the tuned .21 engine?

sluggo_sx8

06-12-2009 03:50 PM

Quote:

Originally Posted by Frank L (Post 5929358)

9 to 10 minutes on 1 tank should I be using the 6 or 7mm insert to get that or can I get that run time on the 8mm??

Thanks

Hate2Looz

06-12-2009 04:06 PM

Quote:

Originally Posted by Dave.H (Post 5930309)

What pipe runs the best on the tuned .21 engine?

I found the GRP tuned pipe to be the only way to go for me.

mattwoodcraft

06-12-2009 04:16 PM

i to like the grp pipe with this engine so +1 here
i have tried a few different pipes but seem to go back to the grp pipe

sluggo_sx8

06-13-2009 06:02 AM

hey guys one more question. is it good to keep heating the motor with a heat gun even after breakin? Some people say you should never start a cold motor and others say it really don't much matter after breakin?

mattwoodcraft

06-13-2009 06:46 AM

if the motor still has a bit of nip to it up top it wouldnt hurt these motors take a long time to get heat into them at the best of times

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