The head of the GRP dissipates heat so well that is runs at that temp. A GRP that is running at 220 is not the same as a NovaRossi running at 220. It would be similar to the Nova being at say 260ish.

Thats good that you tune that way. If you do the same with the GRP, you should find that when you have it running good, the temp will be between 170-190. It's just the way they are. The rid themselves of heat quickly, and run the most consistent temps of any engine I have ran.

can someone tell me what break in method. I was leaning towards heat cycle? Also should I use an 086 or an 053 with the non tuned version.

I'm not talking about just one motor but 2. A modded .21 and a tuned .28.
Both were broken in using differant methods. Yet both tuned and ran virtualy the same. The temps at race tune for both engines was in the 225-235 range. I tuned for preformance, not by temp, and both were slightly rich. Running the engines rich enough to get the temps down below 200 degrees is just not practical. I don't know what I am missing. The preformance was fair at best with slightly rich setting I was running them both at. The engines did run flawlessly through out. No suprizes at all.

I'm not going to go into how each engine was broken-in, but it was differant for each engine.

Break-in / pipe
 

I use the heat cycle method found at johnnycoolguy.com. This method has been good to me. The last GRP I broke in using this method lasted well into the 6.5 to 7 gal mark It was still pulling strong when I sold it.

As for the pipe, if you are running on a small, technical or med track use the 053 pipe. If the track is large or has a large straight away where you can really wind the engine up then use the 086 pipe. Best all around is the 053 pipe in my experience.

great thank you. I want to try both and I have the 086 already so would it be possible to use the 086 manifold with the 053 pipe?

What pipe and plug combo are you running in the GRP?

Powerhouse recommended JP-1, and MC-9 plug

Okay, that is about the only thing I could think of is if the head does an extraordinary job of cooling. It does look rather over sized.

I'm gonna break her in tomorrow guys. Should I take out one or both shims if I'm going to run 20% or will it be ok to do break in with them in there and take them out later if I feel I'm not getting enough power or running a high enough compression ratio. Thanks for any input.

on all the motors i have used to race i have never tuned an engine to run at a certain temp i just tune for the day / event and away you go never had any issues at all with any of the motors ... as for running i heat the motor up 4 tanks through idle 5th tank 1/4 throttle just to put some load on the engine after that usually im write to roll for racing :nod::tire:

all tghe time i have been running i have never tuned a engine to run at a constant temp i beleive that weather and temp and track conditions on the day play a big role aswell on temp if you tune your eng to hold a certain temp you may never get the full potential out of the engine ...

what do you guys think ? do you tune to hold a certain temp ?

no feathers ruffled ...if you take the time to search this thread .........you will find that anybody running this motor who has success has had running temps of the range i mentioned ..it is just a trait of this motor ...i do not temp to tune either ...im simply saying from experience that this motor when ran hot is short lived ...the lower the operating temp the longer it will last ....and at the 160-190 ranbe this motor is on a good tune if tuned right ...its just mine and many many others experience ....just saying its easy to get it out of tune ...it will still run great ....but it wont last long ....like i said its all been said and documented here in this thread ...if you choose to believe the hand full of people that say there op temp is 220-230 ...then check back with them in 3-4 gallons and see what they have to say ....just my opinion ....zixxer who plans on getting 10 gallons out of his smokin fast temps low fancy italian grp motor :nod:

i do agree in what zixxer says but i guess at the end of day you never know until you give this motor a go love it or hate it i personnely only used to use os motors and that was it but decided to give this little baby a shot so far happy :nod::nod: i do like the way the motor delivers the power it is linier compared to other motors i have raced with in the past and the fact you get a pipe and all the carby inserts and also a pit towl to dry your tears at the end of the race meet wondering what went wrong its dam good value :lol:

The team uses the JP-1 on the modded GRP's but Mark would not reccomend the mcoy plug, we are running nova 6's and 7's. However, the plug your running would not be the problem.

Before we discredit the motor, what car is it in? Also what are you running clutch wise? As you probably know, sometimes the wrong clutch set-up can cause the motor to bog and not allow it to perform at its potential. The turbo motors spool up quick but too soft of springs can make the motor feel "soft" on the bottom, which is benificial when running on a track that is a bit slick.

I am not trying to argue with you, im simply trying to help you. So the more info you can give me on the motor set-up the better. Like I said earlier,we have yet to get these motors in the 200's and they have been pulling the "tuned" version as well as ninja's.