Does anyone make pistons .040 overbore? CP? JE?

 

damn man, your building it, youre parting it, youre building it, WTF is going on?

 

The motor has to be rebuilt to sell. If I don't sell the car whole I will part it out. It's not going to cost me that much to repair it. Maybe $1000. Next time I'll PM you the official memo. Sorry!

 

Why go that big if you're selling it? You're sacrificing the reliability of the block by going that big. Only reason I see going that route is if you plan on sleeving.

 

bigger bore = thinner cylinder wall.... on an NA motor or low boost probably wouldn't be a huge deal, but If you are selling this as a race car, and implying that it won't have problems, might be better to just grab a fresh block.

 

I spoke with Sam at GTM when I wasn't sure whether I damaged my bottom end when I over-reved the motor. Sam has both Wiseco and Arias pistons that are 1mm overboar. (If I would have gone that route, my personal preference would be the Wisecos.) You might also check with Sharif.

(FYI, Roger checked all of the combustion chambers, cylinders and pistons with a scope, and everything looks good. Hopefully he'll have time to check out the rest of the motor this week to identify my ticking noise. I'm hoping that it is something as simple as the oil pump or water pump, but we'll see.)

 

Do you realize we are talking .5mm per side of the cylinder wall @ .040? I don't know if it needs to be bored out yet because I haven't opened it up yet. Just checking my options incase I need to overbore due to damage. If they make .040 overbore pistons then there is no way in hell I'm going to look for another good block spend $500 and have all that machine work done when I can just go for .040" over unless there is a damn good reason to do so.

 

Your right. I forgot that the 0.04 overboar is specified in inches , which is 1mm. So, yes, Sam has the pistons. They are 96.5 mm, and can be used with the stock sleaves. (I edited my previous post).

 

LArry,

you're only .25mm larger in radius (0.50mm total diameter) compared to what you have now. you already have 96mm bore pistons in your block.....so they'll only increase the radius .25mm (.010") on the boring head. I can't imagine that shaving off 0.25mm of the wall is going to diminish your sleeve strength.

 

The pistons are available from just about any vendor

 

you asked if there was ANY reason ... and a thinner sleeve is the only reason to not do it. of course if the motor isn't torn down yet, you don't know if you need to bore it, and you don't even know if there is damage in a cylinder how big you have to go to fix it.

 

Larry there is no danger in going with a .040 over piston with proper machining. I would have no issue doing this, if I had to. Usually it's done to clean up a damaged hole.

We can make them in any bore size. Pm me if u ned anything.

 

haha.

you gotta stop doing this to me. i get excited when you post about upgrades. then you tear me down when you talk about parting it out. then you pick me back up talking about upgrading. youre tearing my heart out. just upgrade and keep it!

you need my email, for the memo?

 

Hahahahaha.... it isn't easy to get rid of a car like this. The economy is horrible compounding the problem. If I can sell this as a whole car I would like to do that. But I wouldn't sell it with a known flaw. The engine certainly needs to be freshened. The other issue is the fuel starvation in sweeping tright hand turns which i think may have leaned out the A/F misture causing this. I would like to correct that too. I would then feel confident selling it whole to someone as a car that works. If that doesn't happen I will part it out. I really need a much more reliable car designed for what I do. Sharif own his own shop, Billy @ M-WorkZ owns his own shop. Rob @ Robispec has his own shop, Double Down has his own shop. Getting the picture? I can't comptete. I don't have my own lift, I don't get parts for cost. I am a man with limited means.

I am currently looking for someone that wants to buy a 1/2 share of a Radical SR4 to share the costs. So that's the plan. That's all the memo said.

 

+1

You are a good guy. Unfortunately, a lot of people will sell vehicles with known problems, and never tell the buyers about the flaws. You are going one step beyond and addressing these issues.

 

But You're a JET PILOT, how can that compare?

 

if the bores look good (out of round, taper, no deep scratches) you can just get a fresh hone and new rings. a good machinist can remove hardly any material and leave ya with a fresh seating surface for new rings. in other words, you can reuse the same pistons if all looks good.
iirc, i saw you didn't have many miles on the motor. i have been able to do this before on mine with 20k miles on it because of almost no cylinder wear. cheap, simple, effective and solid repair.

 

I don't know if their any heat issues with this over bore? Ask the Sharif or George (GTM).

Is a Radical (the track car) in your future if you sell your Z?