What is the max you have stock sleeves bored out to...and run reliably N/A. 82??83??

 

82

 

jg on wd40 bseries power shoot out used 83 mm.was able to get i think if i remember correctly 259 cank hp.

 

Was this street driven? How high was he able to rev?

 

haha imboring to 81.5 now, im scared!!


i havent seen anything, but i bet 82 would be alright, and 83 would be pushing it!

 

82mm is okay as long as your water temps are in check.

This is according to my professional engine builder friend.

 

i have seen 83mm. daily driven jg did the work

 

I know the Tech43 kit uses 82mm pistons. I am not sure if that kit would be as rev happy as a B16, and if it does handle 10k how long it would last? I am thinking I may just use an 82mm piston w/ stock b16 stoke. Not sure if this would even give better results?Rocket, can you tell me exactly how much this would increase the displacment?

 

Multiplication

82x82x3.14x77.4 divided by 1000 = 1634cc
81x81x3.14x77.4 divided by 1000 = 1594cc.

40cc increase or about or 2.5% bigger.

So if you assume that the power will increase 1 for 1 with the diplacement this is worth ~ 3 - 4whp on a 150whp motor.

 

To run a reliable motor, I wouldn't go past 82... no real reason to unless you destroyed your stock sleeves and need to. Reliability > slight bore increase.

 

Thanks rocket........What are your opinions on the tech43 stroker kit for a daily driver?

 

To be honest,

I only really like CP Pistons (For disclosure purposes I am also a WD with them) . But other pistons have worked well from what I've seen.

 

I like Cp pistons as well. They have very nice quality. I was thinking of using 82mm cp pistons w/ C/R of 11.7-12.1.1. We recently used 83mm cp's in a b16 (sleeved of course) and made 13 hp over 81mm with the same set up. This is the whole reason I was asking....I want to try it on my street motor. Thanks for the input.

 

I can have custom CP made for almost any doable config.

There are also alot of goodies that can be done to custom pistons that are not offered in their shelf line up.

 

82mm is safe if you do not overheat-it. do not overheat stock bores either. Never done 83mm but thinking about it.

 

We also have a high comp dome design that is pretty trick. Donf knows about this.

 

I built a motor with 82mm Topline pistons and have had no problems at all.

82mm is the max I would go on stock sleeves.

 

I am not sure if I really want to stroke my new motor. over boring it a bit looks good right now....I want a high revving motor..

 

my motor is gonna be 82mm.

rocket - aftermarket radiator enought to keep temps in check? u think a earlier opening thermostat would be worth nething?

 

A slightly colder thermostat would be nice.