20v piston n rods to blue top??

[Melo]

hi people.i wanna ask something.i found piston n piston rod for 4age 20v but the problem is i got a blue top(16v) 4age.could i use the pistons or the piston rods.is there any difference between 16v's n 20v's piston n pistons rods??would it make me gain some more HPs??

[freakinbox]

no point in using the pistions... as they are cut for 5 valves rather than just 4 like your motor

[Melo]

What about piston rods ?

[Flashmn]

Whats the point really?

16v pistons wont work in a 20v. Also, you wont make power with rods. Blacktop rods are lighter I think.

[punter]

20v pistons into a 16v is a good idea. nice high compression. (Head volume of a 20v is very similar to a 16v)

Problem is the gudgeon pin is smaller on the bluetop (18mm vs 20mm), can't run different rods on a bluetop crank either as the bearings are smaller also.

You can machine out the blutop rods to accept the 20mm gudgeon pin, but that's quite a bit of effort.

And also why is everyone so hung up on making the engine non-interference?
(to the point where you would machine a piston)

I've never seen a cambelt break before it was due for replacement.

[Melo]

Originally Posted by Flashmn

Whats the point really?

16v pistons wont work in a 20v. Also, you wont make power with rods. Blacktop rods are lighter I think.

point is i dont have any piston rods and i cant find out any 16v rods in here (Turkiye/Istanbul)
where can i find them??can u help me with that??a link or something else?? thanks

[freakinbox]

Originally Posted by punter

20v pistons into a 16v is a good idea. nice high compression. (Head volume of a 20v is very similar to a 16v)

Except the reliefs cut into the pistions for the valves are wrong.... Since one has 4 valves and the other had 5. So actually... bad idea

[punter]

Originally Posted by freakinbox

Except the reliefs cut into the pistions for the valves are wrong.... Since one has 4 valves and the other had 5. So actually... bad idea

What's the big deal with having an interference engine?

You're talking as if it won't work, it works just fine. I know of 2 cars in our car club that have/do run 20v pistons in a 16v.

Do you relise that blacktops are interference from factory?

[Flashmn]

Theres nothing wrong with interference engines, infact theres alot of them in normal factory cars, opels, fords, volvos for example are interference and some have timing belts.

[punter]

I know, I just can't understand the "avoid at all costs" attitude of some people on here have.

[Flashmn]

Only problem I see is that you cant use "big" cams with it, because theres a chance it will hit when the valve is open longer.

[Donald]

Yeah, but does anybody know how he can get the parts that he needs. He is in Istanbul, Turkey.

Melo. Try < http://www.toyz-unlimited.com/ > I don't know if they export, but they might be able to help you find your parts.

Good luck.

[punter]

Originally Posted by Flashmn

Only problem I see is that you cant use "big" cams with it, because theres a chance it will hit when the valve is open longer.

Your timing would have to be really really bad for them even be close.