Building my 3.4L

[Anonymous]

Hey yall

Well before I continue onto my Fiero expedition, I am going to pull the motor out of the red car and build it up. Since I will be doing all of the building, I have money to spend to make it over stock.

Here are just some crazy ideas that I have, and I want to know if there is any reason why they will not work.

First of all, how far can it be bored out safely? Don't worry about pistons or rings, I have that covered.

Secondly, I'm going to assume rightfully that the new 3900 gets its displacement from a bore AND stroke increase. Since both are 60* V6s, essentially the same block(IIRC), what are the chances of a 3900 V6 crank fitting in a 3.4L DOHC? Would anything need to be done to accomodate it? Like cutting the block any?

That should be all for now, thansk for the help!

[Gemmer]

bore info:

http://60degreev6.com/modules.php?op=modload&name=DOHC&file=index&req=viewarticle&artid=8&page=1

There was an article about stroking the engine round here somewhere...

[Gemmer]

I cant find it, but it stated that our setup was optimal for some reason i dont understand because I havn't read up on the subject

[RacerX11]

Re: Building my 3.4L

Secondly, I'm going to assume rightfully that the new 3900 gets its displacement from a bore AND stroke increase.

Your assumption is wrong. The 3900 shares the same stroke as the 3.1/3100/3.4/3400/3500, but with the bore sretched to 99mm bore to get the extra displacement.

Marty

[Anonymous]

Wow that chart helped a lot, and I have never seen it before. Thx Gemmer.

Wow thean I guess I will be leaving the stroke at 84mm...And it says our max safe bore is 93.5mm, which is still .060 over, which is quite a bit. According to that chart, enough to stretch it to 3.5L. Sweet.

That also lists part numbers for ARp studs and bolts, which is good cuz I'd rather not have to get them myself.

[RacerX11]

Those stud PN's won't work if you plan to run a windage tray.

Marty

[Anonymous]

What are the advantages/dissadvantages of a windage tray. My pan will hold an extra quart btw if that is helpful.

Thanks

[blk92z34getrag]

Doesn't a windage tray keep the oil from foaming?

I'm pretty sure that's what it does.