M20 stroker questions?

[Kotty30]

Thanks but will the I rods work with the work with eta crank custom pistons 885 head and a bore for sure (obviously if put together properly?


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[jeffnhiscars]

The bore would likely be worn and not round anymore unless it's a new block or very low mileage

+1

Def don't out new Pistons in an old block. The cost of a rebore relative to the Pistons is small but the advantages are significant.

This is the "best practice".

[Kotty30]

Thanks for the info!


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[mr2peak]

Here's some great info on building a 2.8

http://www.e30zone.net/e30zonewiki/index.php/Building_a_2.8

[digger]

The bore would likely be worn and not round anymore unless it's a new block or very low mileage

[Kotty30]

Thanks for your guys input! I do have a question tho.. If I get custom Pistons but have them be stock bore size. Why would I need to bore it?


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[SkiFree]

Gotcha, initially understand then that if your stroker build will be speced for a future turbo setup that you will not see a dramatic increase in power while it's being driven NA.

As Jeff said, if you are planning on custom pistons and turboing it then you need to plan on boring it. I cannot emphasize enough the importance of good machine work, (from boring the block, rebushing the rods, balancing, etc.). If you sit down with your machinist and tell him your intentions, chances are they already have a preconceived idea of what needs to be done (without doing too much or too little).

On the rods, the 135mm "i" rods are doable but if you want, use the M52 or S52 rods. Perhaps you could find someone selling an M52 bottom end and harvest the crank and rods. I do not recommend a 3.0L or a 3.1L setup for a turbo engine being built to last.

[jeffnhiscars]

My only thought is that if you intend to do a complete tear down and buy new Pistons...custom or not...then you should rebore the cylinders to guarantee proper tolerances. Honing alone won't get you there.

[Kotty30]

What are your intentions with the car? Is this a fun street car, a dual purpose car, a race car? Do you plan on owning it for a long time? Do you have smog limitations? Are you prepared for tuning? Do you have a strict budget?



What you propose now would be considered a 2.8L build (w/ an 85mm bore), given the low cost of an M52 crank there is little reason to not go with it instead.

My intentions are to go turbo but before I do that I want to rebuild/stroke bottom end so I feel confident in a turbo build. Everyone always tells me to just slap a turbo on it and don't touch it but I would have a feeling in my gut every time I get on it and I don't want that. It will be a street car. Maybe down the road get on the track a little but not in my plans. I do plan on owning for a long time already have a lot of money into the car and I love it and probably couldn't make a profit if I tried to sell it. No smog limits!! I'm not prepared exactly on tuning yet I have some stuff in mind but planning on doing that after the build! Thinking a standalone! And I would like to keep it as cheap as I can but not without it being crap I'm willing to put money into it just don't wanna spend 15 grand to make a 300hp engine. I also was trying to stay away from boreing it! Thanks!


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[SkiFree]

What are your intentions with the car? Is this a fun street car, a dual purpose car, a race car? Do you plan on owning it for a long time? Do you have smog limitations? Are you prepared for tuning? Do you have a strict budget?

What you propose now would be considered a 2.8L build (w/ an 85mm bore), given the low cost of an M52 crank there is little reason to not go with it instead.

[Kotty30]

So I'll tell you my plan at the moment and I'd appreciate it if you corrected me since I have done to much research on stroker builds.. I'm currently rebuilding my m20 I was thinking about putting the eta crank in keeping the I rods and getting a set of customs Pistons. I'm also going to hone cylinders and new rings and bearings of course. Is their anything wrong with that? I see a lot of people recommend eta crank with eta rods but will the I rods work with eta crank? What size engine will it be considered if I do this? A 2.7? 2.8? Just looking for some advice and direction thanks!


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