Aftermarket Performance Built Block Options...Inputs

[USAF_G35_Guy]

There's the obvious Cosworth built VQ35 blocks

There are various stroker kits on the market

Anyone heard of the quality of these blocks?http://www.importpartspro.com/shblpa.html

I'm in shop around mode right now.

My engine might be blown, so I'm getting a few game plans together.

weird...always heard the lower end was good up to 400whp and I was putting down less than 300whp all motor with 63k on the motor.

only thing I can think of...musta been my UR Pulleys, gave the crank a little bit to much play and screwed up the balancing.

Oh well, live and learn (note to self, never screw with previously balanced assemblies)

...so ya, anyone know a good place to buy a fully built block?

[pfarmer]

There's the obvious Cosworth built VQ35 blocks

There are various stroker kits on the market

Anyone heard of the quality of these blocks?http://www.importpartspro.com/shblpa.html

I'm in shop around mode right now.

My engine might be blown, so I'm getting a few game plans together.

weird...always heard the lower end was good up to 400whp and I was putting down less than 300whp all motor with 63k on the motor.

only thing I can think of...musta been my UR Pulleys, gave the crank a little bit to much play and screwed up the balancing.

Oh well, live and learn (note to self, never screw with previously balanced assemblies)

...so ya, anyone know a good place to buy a fully built block?

You engine may be blown? What is leading to this conclusion (frozen)?

Perry

[USAF_G35_Guy]

rod knock.

thought may be valvetrain, so removed upper/lower plenum, intake valve covers etc...to view the cams and valve train.

was going to pursue underside of heads further, but after pulling the radiator, and everything off the front of the motor we turned the crank we could then hear the noise was definitely coming from inside the block.

also, the metal shavings in the oil pan gave it away, when we got that far into it.

so ya...rod bearing gone and not gonna mess with a rebuild

...so anyone deal with or heard of anyone dealing with these guys? http://www.importpartspro.com/niin1.html

thinking about getting the Stage 2 Longblock package and keep the car for many years to come. with a turbo or SC eventually

either gonna go with used motor if I intend on selling, or new build motor if I intend on keeping. or VQ40DE block with HR transmission...we'll see

gonna punch the numbers and look at my options and go from there.
Modified by USAF_G35_Guy at 10:25 AM 9/11/2009

[Poyzinous]

rod knock could very well be balance related. My opinion on pulleys and crank mods are to never consider them. The short block can in fact handle 4500hp NA, as there are race motors built with them. However you need new pistons if you want more than 500 FI hp.

[USAF_G35_Guy]

rod knock could very well be balance related. My opinion on pulleys and crank mods are to never consider them. The short block can in fact handle 4500hp NA, as there are race motors built with them. However you need new pistons if you want more than 500 FI hp.

I don't plan on carrying over my UR pulleys on the new block. I do however have a JWT LW flywheel that I will probably reuse from the other motor. Haven't really heard of them having any negative effects other than the extra noise levels.

[pfarmer]

I don't plan on carrying over my UR pulleys on the new block. I do however have a JWT LW flywheel that I will probably reuse from the other motor. Haven't really heard of them having any negative effects other than the extra noise levels.

Any place on the crank could cause issues. One thing to keep in mind is that while pulleys, etc. may well be perfectly balanced there are other considerations such as harmonics, criticals, vibration, eccentricity and so on that take place on any rotating mass. These exist along the length of the shaft. This is not to state that you should not do what you want, just that it is entirely possible to introduce stresses that could eventually lead to failure. I have seen shaft failures and other issues on very long shafts with as many as 11 bearings where a change on bearing loading on one end affects bearing loading on the other end. Sometimes you will see this with every other bearing, sometimes every third. Changes in rpm and load changes the pattern as well.

Nearly impossible without some very sophisticated equipment to really state it would be 'ok'.

Perry

[kmech_7]

Give me a call... we can talk about built blocks....

(619)990-8170

I'll give you the info on them all....... Help you make a wise decision....

[USAF_G35_Guy]

Give me a call... we can talk about built blocks....

(619)990-8170

I'll give you the info on them all....... Help you make a wise decision....

steering away from a built block. I don't have 10k+ for a built motor and labor right now or the time to have a garage baby and build it myself.

So I'm gonna either go with a original motor with low miles swap OR!

I'm gonna go with a :

VQ40DE with (05+ frontier, xterra, pathfinder)VQ40DE heads or VQ35DE heads if they'll fit. either way gonna use VQ35DE cams (JWT C2 to be exact)VQ35HR 6MT transmission (07 or 08 350Z transmission)

I've been searching and searching and can't find anyone who has dropped a VQ40DE in anything! besides a frontier or something. But I haven't found anyone who has tried and failed either.Everything should bolt up for the most part, my only worries are the trans tunnel, deck height (might need new hood and headers that fit will be hard to find, so might need custom), clutch slave will need changed over too the new internal style, and I'm not 100% sure if the G/Z intake/plenum will bolt up w/out any fab work done.

Hopefully I'll have some G40 pics in a couple of weeks!I love me some Frankenstein builds

thx again for the advice and input guys^^^^
Modified by USAF_G35_Guy at 6:16 AM 9/10/2009

[Poyzinous]

Dad has a VQ40 Pathfinder. Its been rock solid for 60,000 miles without a single issue. The motor has very good power. And its a lower compression motor than the VQ35 (9.8 to 10.3) so a Stillen supercharger would be a great addition. You'd have a torque monster. If it does work, you'll be the only one in the world as far as I know.

[Cpt_Impossible]

Here is a quote from a similar discussion of the use of VQ40 parts on My350Z.com by HKYStormFront:

"it has been mine (and the frontier community in general) that the HR block and the VQ40 block are the same (not the same as the older VQ35DE block, upgraded coolant and oil passages). the heads are also the same from what research i have seen (we've had a few guys take their engines apart so far). also, 350z cams fit in our heads with no modifications. the nismo (and stock Z) thermostat also fits. the pistons are the same size but are a different compression ratio and the rest of the rotating assembly (crank and rods) are where the extra stoke length come from. so if you were to swap in a vq40 "block" it would be the same thing that you already have (again, from what i've heard).what you are looking for is the crank and rods, but as the others have said, buying a proper stroker kit with better rods would be good since while the crankshaft is forged in both the VQ35HR and VQ40DE, the rods are not and are the weaker link and usual suspect when there is internal engine issues"

If this is true, changing out the rods and crank but leaving in the high compression pistons and running the stock tune from the G35 designed for premium fuel (the VQ40 is tuned for 87), you could probably see some nice gains. Or, using the lower compression pistons sized for the vq40 for a 4.0L monster FI engine.

[USAF_G35_Guy]

thx for more info^

Here is a quote from a similar discussion of the use of VQ40 parts on My350Z.com by HKYStormFront:

the heads are also the same from what research i have seen (we've had a few guys take their engines apart so far). also, 350z cams fit in our heads with no modifications.

to expand on what cams and what heads etc... are compatible/swappablehttp://www.jimwolftechnology.c...s.asp the S1, S2, C2 cams to be exact

VQ40DE cams and VQ35DE cams are swappable even though the design of the 40 heads are closer to a VQ35HR. But the technology & functionability is closer to a VQ35DE non-revup...from what I can gather anyways.

[tollboothwilley]

I like where this is going. Keep this thread updated.

[the converted]

So, I have been digging up specs on the 35 and 40 engines. The deck height on the two is almost 30mm different! So if you did want to try and mix and match parts there are a couple of interesting engines that you could come out with. You could have a low end torque monster with the 40 crank in a 35 block with custom shorter pistons. Or if you took a 35 crank into a 40 block with longer rods, you would have a engine that could rev to the sky (personally I think this is kind of interesting and would be a blast on a track).

Other than that stuff, they seem to be highly interchangeable. The deck height difference really is a killer for thinking about swapping any of the rotating assembly without some custom order parts.