40 replies to this topic

[mini_turbo_pete]

957cc fiesta's had 74mm pistons

1117cc & 1297cc Fiesta's had 73.97mm pistons

1493cc midgets had 73.65mm pistons

1400cc Mitzubishi's had 74mm pistons

[alexcrosse]

sweet, what mitzers were they?

Cheers, Alex.

[alexcrosse]

im pretty sure they exist since thats bill richards writin up there.

could be jammy;s

LMAO! im actually giggling in my chair as we speak.

[GraemeC]

It may be Bill's writing but it is obviously an abbreviated note and may not read exactly what he meant.

To be precise, Sprocket is correct, Cosworth little ends do not exist - at least not in an A series.

The little end is part of the con-rod that's all. Unless Bill has cut and shut your conrods to fit some different little ends produced by Cosworth then they will be Cooper S or midget little ends.
They may have been reamed to fit bushes and fully floating pins and they may have been reamed to Cosworth specs but they are not Cosworth little ends.
The bushes and pins may be supplied by Cosworth but again the little ends per se are not Cosworth.
The little end assembly may contain Cosworth parts but they are not Cosworth little ends.

[mini_turbo_pete]

sweet, what mitzers were they?

Cheers, Alex.

they were Lancer 1400cc from about 1978ish.

[alexcrosse]

its the bush and gudgeon pin, as i said above. Theres not muuuch to abriviate there.

[Sprocket]

nah, offset bore the block to 73.5mm, then get an engineering company to press the gudgeon pins in and ur done

Sprocket, i have done alot of research, infact i bought and sold powermax pistons because of amount of people turnin me away from them. But your right, yours will be 74mm and different. And i wasnt getting shirty, your the one that said cosworth fully floating little ends are mate up and dont exist... i was telling you there not

Who said I was talking about the 1400? Check my profile <----


Forged pistons need a larger piston-bore clearance, as the expand more.

[Sprocket]

its the bush and gudgeon pin, as i said above. Theres not muuuch to abriviate there.

It wont be the pin, it will be the bush, and if anything, the plastic buttons. The pins are matched to the pistons

[romblu89]

so....to make it clear....an offset bore is needed...since they are 73.5mm & they can be fitted in either bores....no bush in the conrod is needed right since they are of press fit type....is that all?

[Sprocket]

Move the bores in pairs 1-2 and 3-4, 10 to 15 thousandth of an inch away from each other so that the distance of bore centers between 1-4 and 2-3 have increased by 20 - 30 thousandth of an inch, but distance of bore centers between 1-2 and 3-4 remain the same.

Some people also say to move all bores towards the push rod side of the block by 15 thousandth of an inch, but on a 73,5mm bore i dont think its required.

Do not get the impression that boring to 73.5mm is problem free, not every block takes it, due to poor castings, and you wont know untill you do it.

Dont forget to have the bores sized to the piston+bore clearance, which is larger with forged pistons, do not use cast piston clearancies as the piston will sieze. the actual bore size is roughly 0.12mm less than stated on the size of piston but may be closer to the stated size with the forged pistons larger clearances.

and yes, if you use standard connecting rods, the pins will be press fit, so no need to wory about all this floating stuff

[romblu89]

aaa finally...it took too long.....lol...thanks alot!!