I am considering going boosted, and was trying to put a setup together with the short block i have. The only thing i am worried about is my quench i know its not optimal, but does it matter with a FI engine?

Bore size:4.03
Stroke:3.48
Head gasket Bore size: 4.120
Head gasket compressed thickness: .046
Combustion chamber cc: 66
Dish piston relief: -6
Deck height: .025

Cr comes out to be 9.3347:1
Anyone see a problem with this setup? It will have a F1A, AI ported trickflows, Intake, around 15-18lbs of boost, meth if needed.

 

I don't see a problem. There is so much turbulence in the chamber when under boost that quench becomes irrelevant.

Rich

 

You didn't mention the piston material, but with 15-18lbs. of boost, you will want to make sure you use the a good quality piston such as a JE that comprised of 2618 low silicon aluminum alloy. You might also want to lower the CR a tad bit, especially if you plan on running 93 octane. Generally, it's more advisible to run less compression and more boost rather than more compression and less boost.

 

The pistons i plan on using are Forged Trw pistons. From what I have researched they are heavy but they are strong, and take a lot of abuse. I would love to make it a little lower on compression but that's as low as i can make it without changing pistons. I would love to use something else but i just bought this motor and i dont want to re balance everything and take the lower end apart,plus the engine is already in the car and running. over the winter i was going to do the heads swap.

 

You will need methanol/water injection.

Rich

 

While TRW makes some good quality pistons, you may want to check what aluminum alloy they are comprised of. Why not use the best parts for the project? 9.3 to 1 compression and 18lbs. of boost will be testing anything but the best quality parts. If it requires selling some of the current parts you own and purchasing ones that are better suited for a particular application (and, yes re-balancing the rotating assembly as well), it would make more sense than installing less than optimal parts and taking the chance of destroying the entire motor if they do not stand up to the limits that you want to push the motor to. If you choose another piston, you will most likely be able to lower the compression as well as upgrade the quality.

I believe Steve, known as 97WS6Pilot on this forum currently uses a set of TRW pistons in his F.I. motor and makes some pretty impressive power, try contacting him.

 

Meth is not a problem if i need it. Will nitrous work like meth also?I have a pretty nice nitrous system all ready i can just de jet it for a 50shot or so. The boost psi is not a set thing it was more of a reference to a range. My goal is to make my car impress me again(600-700 hp). Had the old engine on a 175 shot got board of it(450hp). Its a street car nothing more, its full weight with power leather seats. I would love to build another engine but i just cant afford a new rotating assembly right now. I will contact 97WS6Pilot and see how his stuff is holding up. Right now im just trying to see if its worth it to go boosted and if it will work or if i should just go solid roller and more spray. Thanks for all the help guys

 

My car is holding up pretty well. Every now and then when I start it up hot I will get a little puff of smoke out the tail pipe. It has about 30,000 miles on it and about 10 passes at the track and it is running extremely well. I'm thinking that the head gasket may be seeping a little coolant into the chamber. I am having no trouble with my TRW pistons, stock crank and stock rods on 15 psi. I only spin it to 6200 rpm though. I think your build looks good. If I did it all over again I would use trickflow heads like you are doing. As mentioned before I highly recommend methanol injection and not nitrous.