L17

[Dirttrack510]

Yeah. It's called an L18.

Only if you use the L18 crank and rods... I'm planning to use a L16 crank and rods, with the L18 pistons like you mentioned at the start of the thread. I wanna build the "L17" :P

[ggzilla]

Well, we bore the A15 out 3mm routinely. Some even go 4mm if naturally apirated. But the A15 is one tough cookie.

 

Why couldn't you do the same for an L16 block?

[Dirttrack510]

I don't know. I was just asking, because i didn't wanna order a $500 set of forged pistons I couldn't use. :( I'm wanting to do this on my race engine.

[ggzilla]

Good point, there will be some limit to reliability. With the A15 that is +3 overbore. If you go +4 and hit high power levels it has some problems, so sonic checking is advised at that 4mm overbore.

 

What is that limit for the L16 block?

[Laecaon]

I think I read over on OZDAT that the L16 block only like up to a 85mm bore.

 

The L18 could go up to 89mm, but 87 is safer, and it would be wise to sonic test it before hand.

[Dirttrack510]

It's not that much of an improvement over 1.6 liter to go to 1.7 liter, maybe I'll just order something like .040 overbore L16 pistons, so I don't have to worry about it. Sorry by the way about posting my own questions on your thread. I didn't mean to thread jack ya. ;)

[ggzilla]

100cc on an L16 is worth more HP than a 1.0 increase in compression. Isn't that worth it?