[oldster]

Re: Celica motor big bores!

If the distance between centers is in fact 87.5mm, then you could safely go 84.5 mm for race only all-motor stuff. Probable 83-83.5mm for turbo and street use! Rulse of thumb, distance between centers minus 3mm is the biggest bore you can run for race only all motor stuff. Turbo or street use is then minus 1mm from that! Get it? Got it!

So if you took it out to 83MM what would be the resulting displacement?

 

[oldster]

To get the displacement, I would need to know the stroke of the motor, then I could get the overall displacement. If you can, also let me know what the stock specs are of the entire motor. Thanks.

If you need any more detail than this I don't have it readily available.


Bore 82 MM
Stroke 85.1 MM
Displacement 1796 CC
Compression 11.5:1

 

[oldster]

Increasing the bore size 1mm ( 83mm ) will result in a 46cc increase taking it from 1796cc to 1842cc or 1.842 Liters. Not alot, but noticable. The way this motor looks, most of your power upgrading is going to be from stroking or boosting, both of which are beneficial to have beefier sleeves in anyways!

I agree, as a standalone mod it wouldn't be worth the time or money. If it were purely linear (CC = HP) that would give you approx 4.6HP more. Thanks for the info.