just been speaking to my engine builder and he said he never builds any cossies with offset gusgeon pins as they wear the pistons quicker and saps the power?
he said only good thing about offset pin is o reduce noise thats it.

is this true?

 

99.99999999999999999999999999% of pistons have off set gudgeon pins

 

2wd dont have them

 

genuine cosworth pistons have offset pins to reduce piston slap.

 

thought 2wd didnt and 4x4 did?

 

2wd dont have them.

I thought they helped with the thrust angle reducing wear!

 

i have a 2wd so if im getting forged pistons i wanted to use 4wd offset ones but if its true that you lose power because of the offset i will get 2wd forged ones

 

i have cosworth racing pistons and they are 2wd spec,so dont have offset pin

 

do you REALLY think itll lose any noticeable power?with ALL the people out there running big power 4wd engines?

 

how much power we talking about. 2 horses or less

 

why do they give you the option of 2wd or 4wd pistons if the 2wd give piston slap. they might aswell sell ust 4wd spec without the slap to everyone

 

4wd pistons in a 2wd motor reduce the compression ratio to about 7.8:1 IIRC

 

Who do you use Dave Walker ?

Mike

 

I thought they'd stopped making 2wd pistons!

 

i ran 7.5 to 1 4wd ones so mine did along with thicker top ring lands iirc

 

Same here James!!!

 

Roosie, I suggest you change engine builders then, as his advice is completely wrong in respect of a normal YB engine. Having an offset pin reduces piston wear due to reduced piston rock at low rpm, and hence reduces noise! It won't make the slightest bit of difference in power either! Your engine builder is a clown to suggest running centre pin pistons in a YB!

Edited to add, there are some minor benefits to centre pin pistons for engines of 10K rpm upwards, which rather rules out 99.9% of YB's!

 

yeah as all the replies above. So Roosie was it Walker or was it Damico?

 

Damico Scrote

 

Edit,
Dave Walker does ZERO engine building, and does NOT offer advice as he does NOT deal with that side of engines, just mapping etc.
BOTH 2wd and 4wd pistons have offset, just diffferent amounts.
tabetha

 

What tuner is that Roosie, l only know Dave Walker when l lived in Elveden,

Mike

 

He mentioned Damico above Mike

Nice advice Karl, clears it up spot on if you ask me!

 

I say hes my engine builder realasticly hes not he just done bits and peices
Impulse developments have been doing my headwork lately and i cant fault the service from Adrian, and when it comes to mapping and tuning advice its Dave Walker @ Emerald when i do get a chance for mapping. I Think i will knock Damico on the head completely tbh this would be the 2nd bit of bad advice ive had lately

 

Literally, do it with a gudgeon pin!