VH45 Parts

Post by **John Dixon** » Thu Jul 07, 2005 7:00 am

Finally sorted out the parts for my build Got rods and pistons being made now:) 98mm bore, 11.2:1 CR. Should be good for 8.5-9k Hoping for 450-500bhp with the new cams and intake / headers.

Post by **elwesso** » Thu Jul 07, 2005 7:09 am

Great update john!!!!!

So this engine is going to revv to 8.5 to 9k RPM... I want to drive that!!

Post by **CrimsonQ** » Thu Jul 07, 2005 10:49 am

Sounds awesome!!

Any price figure?

Post by **John Dixon** » Thu Jul 07, 2005 11:41 am

Yes, that rev limit is the idea. Might only do it once but I hope not!!!Prices - expensive. We have to pay way more over here than you do in the US, but if you're interested I'll let you know once it's all finalised.

Post by **DAEDALUS** » Thu Jul 07, 2005 11:54 am

I'm much more interested in the work that's going into it, and the dyno sheet when you're done of course. So new lower end components and cams. Stock valves/springs/curtain area? What else? New injectors/adjustable FPR? Sounds like fun!

Post by **Black95Q** » Thu Jul 07, 2005 11:58 am

What type of camshaft modifications are you planning... regrinds?

Post by **John Dixon** » Thu Jul 07, 2005 12:18 pm

Valves are stock, but the back of the head and stem are cut back to improve flow. Springs are uprated and the HLA's are gutted then shimmed so they're solid.Injectors are bosch 440cc type 3 units to fit the 8 45mm throttle bodies. Management is emerald m3d standalone. Cams will be regrinds, probably 290°duration, but clearance measurements etc still to be done.

Post by **DAEDALUS** » Thu Jul 07, 2005 12:21 pm

John Dixon wrote:the 8 45mm throttle bodies

There goes any possibility of me attempting such a project.

Post by **John Dixon** » Thu Jul 07, 2005 12:25 pm

I can always knock a spare one up!!Problem with stock ECU is having to retain the MAF really. I'm going to map on rpm and throttle angle

Post by **RobertsnewQ** » Thu Jul 07, 2005 1:05 pm

John Dixon wrote:Problem with stock ECU is having to retain the MAF really. I'm going to map on rpm and throttle angle

AKA Alpha-N. Best way to deal with big cams. Is this a street car? Will you use closed-loop feedback for cruise?

Post by **elwesso** » Thu Jul 07, 2005 3:42 pm

Wow... I just cant imagine a VH45 at 8500 RPM. It has to be a thing a beauty..

IS the stroke going to be shorter?

Post by **tkd_q45** » Thu Jul 07, 2005 3:51 pm

Pics Please! Some of us need to live vicariously!

Post by **450zxtt** » Thu Jul 07, 2005 5:31 pm

way to go,john...450zxttvh45dett power,baby.

Post by **John Dixon** » Thu Jul 07, 2005 9:15 pm

Yes, have an WBO2 kit i've been using hooked up to my VG30DETT for ages now, will be using that for closed loop. The emerald can actually do closed loop over the entire map area if required.Wes, no, standard stroke + 98mm bore for 5.0lWill post up some pics of the parts and build when I get a chance to take some!Oh and yes, it's a street / trackday car. Might do a few passes down the strip in it, but straight lines aren't really my thing.

Post by **QShip** » Fri Jul 08, 2005 2:54 am

John Dixon wrote:Wes, no, standard stroke + 98mm bore for 5.0l

You bored the motor to 5.0 liters?

Post by **John Dixon** » Fri Jul 08, 2005 3:21 am

Yep, certainly did

Post by **maxnix** » Fri Jul 08, 2005 3:35 am

John Dixon wrote:... no, standard stroke + 98mm bore for 5.0l

Mmmmmm.....you are my hero.

Don't think pistons and rods will live too long at +7400 rpm, but it should be a lot of fun getting there. Interesting to see if cylinder walls can live with 5 mm less material. Please take pictures of sleeving operation and post them and material specifications.

Valves should be able to handle extra .5L as the area per cylinder capacity is greater than VQ35DE. Any relief of the head at the block mating area, or are you leaving a 2.5 mm overlap of the piston?

Seems like stock ECM and MAF should be prettey close to ideal with 10% of 15% safety margin effectively removed by increased capacity.

Post by **John Dixon** » Fri Jul 08, 2005 4:48 am

believe me, these rods and pistons will hold up. It's the crank I'm worried about TBH.Probably going to leave the CC as it is, figure the extra 2.5mm squish are won't harm.No chance of using stock stuff with my setup. Too much hassle to get it running in the ZX chassis anyway, then mapping would be a nightmare - all the maps would need expanded out past the stock rev/load limits.

Post by **RobertsnewQ** » Fri Jul 08, 2005 7:42 am

maxnix wrote:
Don't think pistons and rods will live too long at +7400 rpm, but it should be a lot of fun getting there.

Actually, with an 82.7mm stroke, average piston speed at 7400 RPM is only around 4000 fpm, which is nothing. The stock pistons and rods should by just fine with that speed, since they're undoubtedly forged. With aftermarket rods and pistons you should be able to hit 5000 fpm plus, which is over 9000 RPM (if the valves don't float before then and give you an unwanted rev-limiter!). A V8 is just two 4-cylinder engines. There's no magic to this stuff, as Mr. Dixon has discovered.

Good luck with it John. Are you using stock lobe separation/timing for the cams? With long open timing you'll probably find that you can't use closed loop for low speed operation, but I guess that depends on how much lobe separation you're running. I'd love to hear more!

Post by **John Dixon** » Fri Jul 08, 2005 9:13 am

Haven't finalised cam specs yet, leaving that to someone who understands it better. Will let you know what I end up with.

Post by **maxnix** » Fri Jul 08, 2005 1:11 pm

RobertsnewQ wrote:Actually, with an 82.7mm stroke, average piston speed at 7400 RPM is only around 4000 fpm, which is nothing. The stock pistons and rods should by just fine with that speed, since they're undoubtedly forged.

Pistons are cast for more uniform thermal stability.

Crank is forged, I believe.

It's not just piston speed, but piston and rod mass as well.
Modified by maxnix at 8:45 PM 7/8/2005

Post by **elwesso** » Fri Jul 08, 2005 4:58 pm

The bottom line is Mr. John over in england is doing more than any of us!!! a, hes making an N/A MONSTER (MONSTER) VH45DE, and on top of this he's putting it in a Z car.....

HUGE props goes to this dude just for even thinking of this. Easy option is to slap a supercharger on it... John, im glad your doing this i cant wait to see how you get it...

Anyway, when you get those headerslet us know.. Are you running RHD over there?

Post by **maxnix** » Fri Jul 08, 2005 5:46 pm

elwesso wrote: Are you running RHD over there?

By Jove, he bloody well better be!

Post by **John Dixon** » Fri Jul 08, 2005 11:32 pm

Yes, RHD. We drive on the correct side over here. Don't know why you went the other way in the colonies

Wes, headers will be the last thing done, as I need to see how much room there is once it's in the car! They'll be tuned for higher revs than would probably suit a stock engine anyway.

I know S/C is an option, but I prefer aspirated motors. If nothing else they sound better, but I like the throttle response that you can only get from N/A. I might end up S/C one for someone else though.

Post by **maxnix** » Sat Jul 09, 2005 4:36 am

Pictures, John, pictures!

Post by **John Dixon** » Sat Jul 09, 2005 1:12 pm

As soon as I get any! Don't have a digicam, bit of a luddite I guess. Will be doing a picture diary thing of the whole build.

Post by **Black95Q** » Sat Jul 09, 2005 1:14 pm

John Dixon wrote: Yes, RHD. We drive on the correct side over here. Don't know why you went the other way in the colonies

You might drive on the right side of the car but we drive on the RIGHT side of the road I wouldn't like shifting south paw.

Post by **fridayUK** » Sat Jul 09, 2005 2:58 pm

John Dixon wrote:
I know S/C is an option, but I prefer aspirated motors. If nothing else they sound better, but I like the throttle response that you can only get from N/A. I might end up S/C one for someone else though.

i.e. Me! Lol! Going down a slightly different route to John: stock internals, milder uprated cams and N2O injection...though I keep being drawn to the lure of a supercharger don't I John!

Leigh.

Post by **John Dixon** » Sun Jul 10, 2005 9:26 pm

If we can get it under the bonnet of the Z anyway!

VH45 Parts

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