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Planning a build - have some ?'s

 
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Old 03-18-2010, 12:16 AM
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Planning a build - have some ?'s

Hey everyone!

Im in the planning stage of an engine build for my Lude now and have a couple of questions for yall. The main goal for the block is to make it as strong as I can. I plan on having it sleeved and the best balance I can have on the rotating assembly. Intend on using forged pistons and rods as well. I would like to run a 10:1 C/R with a mild boost added.

The car will not be a daily driver. More of a weekend warrior and a track car.

My questions are:

Is a bore and stroke worth it? I was looking into a 89x102 setup for it. I know it changes a lot in the planning as well as the build. What are your views on it? Worth the extra $?

Head oversize valves? Are they worth it for the extra .5mm and 1mm change? Kind of hard to find a good set of cams that support the oversize valves as well.

Oil pump high flow or would I be safe to stick with the stock setup?

Spring pressure What spring stiffness would you suggest for the valves?

I would like for this build to be done over the winter this year. Since we have snow on the ground about 5-6 months a year I have plenty of time to do it (the slow way, the right way). This also gives me plenty of time to think and compare any idea on what I will be putting into it.

End goal is roughly 400-450 hp out of the car. 250ish ft/lbs would be great if I can get it to that level. I am not new to engines as I have been playing with GM 250s and 383s for a while now but this will be my first 4cyl build. So many new things to figure out. I love it!
Thanks in advance everyone!
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Old 03-18-2010, 03:19 PM
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Re: Planning a build - have some ?'s

hhmmm.. *subscribed for this one*

just a thought, also you realize with that much stroke you wont be able to rev it nearly as high as you would with a shorter or even stock stroke length. you'd have a crazy rod to stroke ratio.

also to reach your goal of 400+ horsepower, your gonna have to run more then just "mild boost" probably more like 20+ lbs of boost
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Old 03-18-2010, 08:02 PM
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Re: Planning a build - have some ?'s

89MM bore is fine, oversized valves are worth it, port and polished head is a must, you're going to need lower compression to meet your goals.
you should definately read our turbo and N/A build threads to better aquaint yourself with this motor. best to be 100% sure before you start buying parts.

good luck!
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