Weiseco's or JE's????

[turbovanman]

Quote:

Originally Posted by Danger_overload I have purchased a set of +40's a 255 intank fuel pump AFPR I am going to run 4mm oversized valves, and super 70 turbo, Along with 118 Octain Gas< at a minimum 118 octain. I bored the block .20got a cromally head gasket and A Large front mount Ic. Detination shouldnt be a problem HOWEVER this is always a chance it can happen whenever racing or driving

Whats a cromally head gasket?
118 octane is overkill dude, way overkill, what are you using it for?
What are you using for a calibration?

[moparzrule]

Yeah really, I'm running 22 PSI on pump gas 93 octane with no knock retard...but I do have a G head. Even with the stock swirl you can run 20 PSI easily on pump gas with a little knock retard.

[john1320]

Learned something new here today, didn't know that there were forged pistons- that didn't hold up any better than stock. But hey, I know nothing about pistons- yet.
Thank you for that visual, glhsken.

[Danger_overload]

My bad I did not mean chromally head gasket I ment A cometic head gasket, I am using a stage 5 calibration with a 3200 stal converter, also I have had the Head ported and polished, And I back cut the valves, and I put a Full 3" exhaust on with no cat, Under drive pully and adjustable camgear

[tarkus1]

I have over 20,000 miles on my JE's.

[turbovanman]

Ken mentioned JE makes lightweight and reg pistons, my sure don't look like lightweight, the crown is so thick and the skirts are the same length as stockers so I will be fine, phew. Let the abuse begin,

Danger, nice but I doubt you need 118, that will probably cost you power. Try 100 and see what happens, watching your knock retard of course.

[glhsken]

Quote:

Originally Posted by john1320 Learned something new here today, didn't know that there were forged pistons- that didn't hold up any better than stock. But hey, I know nothing about pistons- yet. Thank you for that visual, glhsken.

JE's are a good piston. Never said not better than stock. Took 350whp and an issue to break a 2.5L piston... Stock would have been taost long before. But the way it broke ALMOST took out a Steve M big valve head... Thankfully he was able to save it.

Tarkus.. what WHP level is 20K miles on. See this thread...

Input on choice of oil.


Great timing and a post from badfastgtc speaking iof the skirt issue.

No one ever said the JE's were total crap. Just that there might be better options.

The "LW" JE's i was referring to were bought unknowingly. Seems to have been what was in stock. Only after the fact did we find out.

[DirectConnection]

The JE 2.2 pistons are very good. The 2.5 design is not so good.

I saw a Shadow make over a dozen pulls while detonating at 344whp and not an issue as he has a 2.2. I have heard of many of the old 2.5 JE's having skirt issues due to the short skirt taking alot of extra side loading from the increased 2.5 stroke and poor rod ratio. Since then, JE has beefed up that area and *shouldn't* be an issue anymore. The main concern of the 2.5 JE is the location of the top ring in reference to the top of the piston. Any bit of detonation, and the ringland gets wasted in short order.

I have a set of the new thicker skirt 2.5 JE's, but am still worried about the "tops peeling off" issue when I start running 25+psi.

So... if you have a 2.2... the JE's are a very good choice (and you can run much tighter piston to bore clearances than any other forged piston out there.... I think it's as low as .002" vs Venolia's .007") But if wishing to run big boost and whp in a 2.5... then I'd stay away from the 2.5 JE. 250whp? Probably not an issue. 350whp... yes. I wish I knew back when I bought these.

[turbovanman]

The bore clearance for the JE's is .004

Guess I will find out if they can take 25 lbs of abuse this summer,

[glhsken]

Quote:

Originally Posted by turbovanman The bore clearance for the JE's is .004 Guess I will find out if they can take 25 lbs of abuse this summer,

Wiseco specifies .0035"

[turbovanman]

Quote:

Originally Posted by glhsken Wiseco specifies .0035"

Always one up on me, hehehehehee,

Kind of a shame, TU didn't have Wiseco's when I bought the JE's,

[glhsken]

just the facts baby!!! hehe

[DirectConnection]

Quote:

Originally Posted by turbovanman The bore clearance for the JE's is .004 Guess I will find out if they can take 25 lbs of abuse this summer,

I am pretty sure the specs for JE's are .002 to .0035. I remember the .0035 part as I was talking with Mike at FM about my JE's a few years back and he mentioned going up to .004 for added insurance since I was going to be running them hard.

Don't worry too much about blowing holes in your's. Remember... Gary ran 2.5 thin skirted JE's in the K-car for quite some time. That was at 35psi, too. The skirts caved in... but I don't recall him torching a set. I do remember a set of torched 2.5 pistons when he upgraded his intercooler and it leaned out for just a tad. I think he may have had mahle's at that point in time.

[Koreth]

this thing with piston clearence, does that account for the rings? or do those get pushed far enough inside the grooves in the piston that they are of no consequence provided gaps are correct?

[Chucksrt]

I wonder how the JE Pistons will hold up in my stroked 2.4 T-III???