maximum bore for a vh45de

[biohzrd]

trying to figure out if/what would be the maximum you can bore a vh45de to. i've tried to find this using the search feature, but have had no luck. would i have to resleeve the block in order to gain a larger bore? thanks in advance.

[Q45tech]

FSM lists a 0.2 mm [0.0079"] overbore piston taking the nominal 3.6608" to a max of 3.6697".

[sijoko]

The cast liners are 3mm thick as per Nissan. Maybe, you could get by with a 95.5mm bore and use the pistons for the VQ35DE.

The question is: "How much aluminum is behind the iron liners?" I would definitely have the block sonic tested before any deep cutting.

[defrag010]

I wouldn't go over .060" without sleeving on an engine that will see some power/performance usage.. I don't care how thick the liners are, I've seen some badddd things happen to .060" bored "stock replacement" alum motors of all kinds.

[biohzrd]

wow .2mm sure isn't very much. thats hardly even honing out the bores. it would be nice to be able to go a little more than that. a 95.5mm bore would be nice just to have the piston choices of the vq35. are there any after market forged vq30det pistons available? i know there are tons for the vq35, but i don't feel like spending tons on custom forgings for the vh45de.

[mtcookson]

Custom pistons actually aren't all that bad. There are some good places that you could probably get 8 pistons for in the range of 800-1000 dollars. BRC Performance makes good pistons at a good price. There's another one out there but I can't remember the name of it for the life of me. I'll find it and post it here.

[biohzrd]

thats a little more like as far as price goes. i would just like to drop the compression down a little if i could so i can run a little more boost, and not fear the dreaded detnation. i'll have to look them up

[defrag010]

.060" is 1.5mm, so you would be cutting the sleeve thickness in half supposedly.

[mtcookson]

thats a little more like as far as price goes. i would just like to drop the compression down a little if i could so i can run a little more boost, and not fear the dreaded detnation. i'll have to look them up

http://www.atomicspeedware.com That's probably the place to go. Its actually ran by one of the Arias guys.

[biohzrd]

1.5mm of sleeve isn't a lot to go with. i wouldn't feel very comfortable with that little material personally. i know je pistons had quoted me a price of around 1400.00 a while back for a set of pistons on a different project. it looks like a set of customes are going to be the way to go.does anyone know much about the vq30det pistons. i tried searching for info but i was really needing compression hieght, materials they are made from, dome or dish sizes ect....