SeanDean
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Posts posted by SeanDean
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For some engines like the Northstar, you can swap heads side to side and make 180* headers much easier:
http://farm3.static.flickr.com/2415/1810190590_1281060feb.jpg?v=0
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That's definitely one option for me. However that engine looks pretty old and with pushrods, something I want to avoid if possible. Like most people here I want to get this engine to rev to around 9000 if possible, so I'm worried that old engines like that just won't cut it.
What I like about vh41 is all the modern bell and whistles: DOHC, roller rockers, electronic ignition, fuel injection, and is probably quite a bit lighter too.
Thanks for the heads up though
Honestly i think the Rover V8 is a better suited motor to the Miata. The VH engines are heavy (I have a 240sx with a VH41DE), and they are large (112mm bore spacing, same as a SBC). The new Titan 5.6 V8 uses the same basic block design and spacing even. So for the capacity you are looking for, the VH block is a lot of wasted space.
The Rover V8's on the other hand came in many displacements (including 3.5L), they are all aluminum still, so very light, they have a lower center of gravity since there are no cams on top, and they allow a low hood line as well as plenty of room in a tight engine bay (Miata).
Oh and you can contact Al Melling in the UK about getting a flat plane crank that will fit in a Rover V8 block.
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Hmm... Ok, got me. That would be UBER COOL with an incredible exhaust note.
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Yes, the first post in that thread is 100% incorrect! There are NO automotive V-8s engine that fire 2 cylinders at the same time.
A V-8 with 2 cylinders that fire at the same time is so wrong on so many design and engineering levels... Talk about a huge step backwards! It would be far easier, less expensive, lighter weight, etc to just manufacture a 4 cylinder of the same displacement. The firing pulses would be the same, every 180 degrees of cranks shaft rotation, no reason to go the through trouble of doubling up on pistons, con rods, valves, etc.
2-stroke V8's
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There was an audi running a flat crank a few years back (totally against the rules). They got away with it for a season or so by saying it was a factory crank HEATED AND TWISTED to change the angle. It sounds crazy and I really don't know first hand. Thats just the story told by my local VW/Audi afficianado (also known as tech support).
Damniit I was gonna mention Ive heard rumors that you can twist a 360 crank into a 180.....
As far as LG goes though, I guess it's possible they are running 180degree headers rather than 180 crank.... But anyone who's ever yanked a motor/"drivetrain assembly" from a C5 or C6 knows there really isn't room for that stuff in those cars....
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I don’t think the rules in Speed GT allow a change in the crank... Im almost sure its his headers that do it.
What's that old phrase about racing.... If you're not cheating you're not trying??
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ooo.. you may be on to something.
Where in South Florida are you? I would LOVE to see that 240SX!!
Palm Beach as a matter of fact. The car isnt really anything special, needs paint and quite a few things to be finished in my mind. It a fully stripped track car though.
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Here's video of Lou in-car
Compare to the factory C5R:
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I'm excited to find this thread. Seems every few months I remember how bad I want a flat plane crank and I search around for stuff.
Here are two interesting things you should know:
1- I am about 90% sure that Lou Giglioti runs a flat crank in his C6 Corvette world challenge GT racecar. Some people have told me it is the LG Performance long tube headers.... bullshit, if you get to hear this car in person it is so obvious.
All the other Corvettes go by: -VROOOOMM, VROOOOM, BOOMING THUNDER-
LG Motorsports Corvette 1000ft away still coming at you -vvvrrrreeeeeeEEEEEEEEEEEE- First time I heard the car I couldn't find it cause when it passed I knew it was an F430..... Now way in hell that yellow C6 was making that noise....
You could hear the damn thing over the other cars for a whole lap.
2- The Nissan/Infiniti V8 architecture shares the 4.4inch/112mm bore spacing of the SBC/LS1. That's all Nissan V8's too, from the 3.5L racing LeMans engines to the 5.6 Titan V8 and everything in between.
I have a 4.1L Nissan V8 in a S13 240SX and have been looking round for years for an affordable option. There are a load of guys with these engines in performance cars, so I think the market is definitely there.
I would see about getting hold of Lou Giglioti and seeing if you can pry it out of him who makes his crankshafts.
Another thing, since the banks are at 90degrees to each other, each bank cancels some of the others second order vibrations, so instead of having 2x the vibation of a 4cylinder, you get 1.4x the vibration
DIY 180 Degree/Single plane/Flat plane V-8 crankshaft…
in Powertrain
Posted
The intake and exhaust ports/valves remain the same, but the exhaust is now in the valley, and the exhaust being on top is the whole point. It makes matching the exhaust runners in the correct order much easier.
Look: