opinions /suggestions on my new build

Maine_MR2 · 05-21-2009, 10:56 PM

The bottom end on my gen 3 went bad and now it's time to decide what to do next. Money is tight but I would hate to stick the car back in the garage for another year after just getting it back on the road. I don't want to do a half-@$$ job either and have to pull the motor a 3rd time. I could buy another gen 3 swap the good parts over and sell the extras. This would be the cheapest but it could end up going boom like my current motor. Option 2 is start with a 2.2 stroker shortblock and build up from there with my leftovers (4" intake, 3" Berk DP and 3" exhaust). I am looking for 300hp and reliability. The forged stroker with mild headwork should be able to take anything my ct20b at modest boost levels can throw at it. Since I am stuck with 91 octane here I will install progressive water injection. Thoughts? What would you do?

John B · 05-28-2009, 03:25 PM

What made your gen 3 bottom end go? I many miles where on it? How much boost where you running?

Maine_MR2 · 05-28-2009, 10:55 PM

It did have one run to 15 after speed source completed the install. I never pushed it over 12psi in the time I drove it. It had about 95,000 miles on it.

John B · 05-31-2009, 09:24 AM

I think you just got a beat motor. A stock motor should handle 300 hp with out much problems. I have been running 18 psi for a year and 15 psi a year before that. I don't think I would spend all that money of a 2.2 for just 300 hp

pas4116 · 05-31-2009, 10:20 AM

yeah you should be able to run those numbers on the set up you had with out spending high dollars....just go through your set up and see whats going wrong..tunning is the key...

Maine_MR2 · 06-07-2009, 09:48 PM

Quote:

Originally Posted by John B

I think you just got a beat motor. A stock motor should handle 300 hp with out much problems.

Agreed. But I don't want to risk gambling on another jdm mystery engine.

Quote:

Originally Posted by John B

I don't think I would spend all that money of a 2.2 for just 300 hp

My goal is an absolutely reliable 300hp. My thinking is the best way to achieve that is to over-build and not push the engine to the edges of what it is capable of. If I can get 300hp out of 12 ~15 psi boost on pump gas I'll be happy. That may mean cams and a bigger 3071 down the road. If I want more later the bottom end will be able to take it.

One concern I do have with the built motor is the forged pistons and the differences in the cold /hot tolerances. That is, is there inherent slapping/ scuffing before it gets up to temperature.

05-21-2009, 10:56 PM	#1 (permalink)
Maine_MR2 MR2 Owner since '85 Join Date: Apr 2007 Posts: 63 Thanks: 0 Thanked 0 Times in 0 Posts My Google Map iTrader Rating: (0/0% )	opinions /suggestions on my new build The bottom end on my gen 3 went bad and now it's time to decide what to do next. Money is tight but I would hate to stick the car back in the garage for another year after just getting it back on the road. I don't want to do a half-@$$ job either and have to pull the motor a 3rd time. I could buy another gen 3 swap the good parts over and sell the extras. This would be the cheapest but it could end up going boom like my current motor. Option 2 is start with a 2.2 stroker shortblock and build up from there with my leftovers (4" intake, 3" Berk DP and 3" exhaust). I am looking for 300hp and reliability. The forged stroker with mild headwork should be able to take anything my ct20b at modest boost levels can throw at it. Since I am stuck with 91 octane here I will install progressive water injection. Thoughts? What would you do?

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05-28-2009, 03:25 PM	#2 (permalink)
John B Cage Fighter Join Date: Apr 2006 Location: CT Posts: 191 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (1/100% )	What made your gen 3 bottom end go? I many miles where on it? How much boost where you running?

05-28-2009, 10:55 PM	#3 (permalink)
Maine_MR2 MR2 Owner since '85 Join Date: Apr 2007 Posts: 63 Thanks: 0 Thanked 0 Times in 0 Posts My Google Map iTrader Rating: (0/0% )	It did have one run to 15 after speed source completed the install. I never pushed it over 12psi in the time I drove it. It had about 95,000 miles on it.

05-31-2009, 09:24 AM	#4 (permalink)
John B Cage Fighter Join Date: Apr 2006 Location: CT Posts: 191 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (1/100% )	I think you just got a beat motor. A stock motor should handle 300 hp with out much problems. I have been running 18 psi for a year and 15 psi a year before that. I don't think I would spend all that money of a 2.2 for just 300 hp

05-31-2009, 10:20 AM	#5 (permalink)
pas4116 technician Join Date: Dec 2008 Location: knoxville tn... Posts: 96 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (2/100% )	yeah you should be able to run those numbers on the set up you had with out spending high dollars....just go through your set up and see whats going wrong..tunning is the key...