Sounds like it would be easier to do a complete engine swap....

 

Probably so, but I'm trying to keep the soul of the car intact...as much as can be with a race car :P that AND I'm stubborn as hell. And I like trying something that's not run of the mill, commonplace, everyday, or comes with a handbook

 

No mate , a shorter stroke decreases cid , you d need longer rods in there in order to compensate for the decreased stroke because the piston will not go back at the top where it was getting beforehand .

Here s some explinations of a destroked motor : http://bikeadvice.in/long-stroke-short-stroke-engines/

That way you re changing the rod/ratio here , meaning that the rods will be longer , the stroke shorter , which will decrease engine torque , making it suscetible to higher rpms with a need of better flowing heads / hp cams as well as higher c.r , better forged or billet conrods & better quality forged pistons as stated above .

her s something about Rod Ratio ; http://www.strokerengine.com/RodStroke.html

If you increase the Bore , you ll increase the cid as well .

Rod lenght doesn t increases or decreases cid .

Hope this helps .

 

Yet another good read...I'm chronicling this stuff for later use

But what you're saying is it won't stay in the cylinder with stock rods?

I was thinking it would increase your displacement because (for more or less the same reason you are talkin about it not stayin in) at it's longest point, there is more room in the cylinder than before...

 

It s not what I wrote mate .

If you have a shorter strock , you ll have less cid & so you ll need to increase the rod s lenght in order to have the piston going to where it topped before , I mean TDC , as it will be lower in cylinder .

Here s some more readings : http://www.car-engineer.com/engine-strokes-definition/

If you have more stroke you have more cid & so if you have more bore .

You stated more room in cylinder , yes but it s not used , so less cid .

 

Also , the block height stays the same , it doesn t decreases , here s some more readings , http://www.hotrod.com/howto/69883_stroke_any_engine/

 

You need the vq25 crank and then maxima rods(or what will fit on the hr crank) and it'll give you a 3.2l, but once you have your oil setup to work with higher revs, more compression to compensate for the loss of displacement, lopey cams, and a trick intake setup. You'll be good to go.

 

Errr I keep forgetting you have an hr, your rods are 4mm longer than the de as is, but you have less bore. Maybe the vq40 rods? I think the vhr has 2mm more, and they just moved the wrist pin up in the piston though...I might have that backwards though.

 

why dont you do best of both worlds.... instead of smaller displacement. go larger and have insane revs, compression, cams....etc.

https://my350z.com/forum/na-builds/5...we-did-it.html

http://www.onpointdyno.com/?p=3209

i believe he has 3.7L crank (VHR), 3.7L rods (VHR), 3.5L pistons (HR).
Rod length is shorter in the 3.7L. Higher Revs

JWT has a piston and cam setup called the C11/RZ1 setup. compression is in the area of 12.5:1.

 

Higher revs but it looked like he lost all his power after 7250rpm? Badass setup though

 

That's cams and breath ability though. The larger displacement will let you run bigger cams, more compression even more. Then it's just air in air out you gotta deal with.

 

Maybe you should go to the last post, he is at 414rwhp, and he made it at 7750rpm and only lost 30hp going to 8500 rpm, what I said earlier and what I am trying to say now, is that this engine will make power at it's current stroke and displacement. BUT, at the end of the day, he has a crap ton of money into a motor that only makes as much as a bolt on LS with way less torque. The only people who run NA with a 350z are trying to stay in a class for road course racing.

I am looking at moving up to the new SRT8 with a 470 hp/tq 6.4 and I am already planning a supercharger....

 

and i'm trying to stay in a class for scca

 

I like my z, I've been able to drive ss camaros and an srt challenger, an r33 skyline, an fd, fc, a rx8,evos,stis, supras, 300zx,m3s a new 5.0 mustang and tons of other fun stuff. All great, but I like my z. Do I have discrepancys with it? Sure. Would I love to own them all? Yup. Do some have things the others don't? Yup of course! Some higher levels or better engineered? Yup! It's all what you like though, and what you want out of it. Now I don't think is ever dump that much money or try to make that out of a na z, but if it's what you want or if it's for a class why not? There's so many great cars and so many great options and so many different ways to do it! I just wish I was rich enough to have a stable with all of em and all the time to mess around with them now I is sad.

 

A Bigger bore is almost always better than a larger stroke.

 

doesn't matter much now, i realized i was reading the wrong section in SCCA, i can't actually do any of this -_- hopes and reams = ruined :'(

 

lol.

This isn't possible.

Displacement is defined as the area of the bore x stroke x number of cylinders.

 

No talk of the oil pump.

The VQ oil pump is the most contributing factor to why you rarely see a high reving VQ.

If you plan to exceed 7500rpm more than a few times, you better plan on a dry sump.