Yep, that's the type of X pipe we plan to use, just need to get it on there.

 

flat firing aka 4 7 swap with a custom cam has been popular in the dirt track world for years so popular that several people make a off the shelf cam for it.

wont get into it here as to not jack the thread

 

That's different than what I'm talking about. That's just a cam swap involving two cylinders. You'll change seven with a flat crank. Using the Ford Modular as a basis (just because I know the firing order, and how Ford numbers its cylinders).

1-3-7-2-6-5-4-8 - cruciformed (i.e. traditional) crank
1-5-3-7-4-8-2-6 - "flat" or "planer" crank

Here's why you do it. For a given manifold, here are the pulse separations
90-180-270-180 (first bank)
180-90-180-270 (second bank)

Now, when you go to a flat crank, here are the pulse separations
180-180-180-180
180-180-180-180

It is the 90 degree pulse separations that kill you. If you go into a common plenum, on either the intake or exhaust, you'll have all kinds of crazy secondary waves going all over the place. With a flat crank, everything is even and perfect. You get incredibly good tuning. Which is why Ferraris and non-NASCAR race car engines like Indy do that.

Sorry for the hijack, doc. Just needed to explain things a little since I screwed up and got it out there.

 

I used the old trick of using spray paint on the exhaust. Doing a few hard acceleration runs then installing the H pipe where the paint has burned off the most.

That's exactly where I had mine installed.


TonyG

 

Here in Europe the trend is to go smaller engines which pollute less. For example my wife just got a new cars which is more or less simlar than her old one. New car have 1.6L diesel engine (all are turbos here) which produce the same power level than her previous 1.9L diesel. Also torque figures are the same, but fuel consumption is much lower than this 1.9L version had. Also same thing with normal gas powered cars. Take for example VW/Audi/Skoda/Seat (use same engines). Smallest engine is 1.2L turbo/supecharged which produce as much power as 1.6L used to produce two-three years ago. Also torque is in the same level, but this engine needs lot less fuel than 1.6L one does. Same style 1.4L engine produce hp/torque what 2.0L produce few years ago; but with less fuel/pollution. twin charged smaller engines are the route the most european manufacturers follow just now.
What comes the safety issues, look like most european manufacturers are going to lighter materials to keep weight down and still make cars more safe as they used to be. OK, this all is off topic to this V8 thread, back to the business.

I would also like to see flatbed crank in some high production less expensive engine, like Chevy V8. I suppose there are manufactureres who build cranks for Chevy engines, at least there were when i build those engines. Don't know how expensive it would be a make an special order for flatbed crank to LSx series engines, would be nice to see, if any manufacturer is willing to build such a crank.
There are also opposite cranks made for flat bed V8 engines. Ferrari did it for Lancia Thema's "top-of-the-line" model(late 80's-early 90's), which was equipped with Ferrari V8 with normal crank.
I suppose you can have flatbed crank made chaply in China....

 

Same trend over here Olli – the only difference is that we used to have 8 liter engines – 5.7 liters is smaller!!!

I still have a 8.2 liter turbo diesel….!

 

8.2L diesel with turbo should have enough torque

 

To tow a house. I lived in Europe and always followed cars. Even now when I go back I get amazed at what they can get out of the 1.2 turbo engine on the Renault clio.

 

Im digging the dual exhaust!

 

+1 it would be really cool to see a flat plane crank for a LSx engine. Surely there must be a reason why it's not commonly available?
Or do 99% of the LSx owners prefer the "truck" rumble to high pitched race (in my opinion) sound?
And there's enough torque anyway

Perhaps too much vibrations with a flat plane crank for a LSx engine?

 

180° cranks induce more vibration than 90° cranks, so this is a problem especially on larger stroke engines.

 

dvc, the vette guys were saying your 944 Ls2 is for sale. I posted on the other forum but no reply. If true i'll take it. reply please asap

 

Not sure if that post is for me. My LS1 944 is not for sale...

 

Sorry Ed, my car is not for sale. I'm installing a built LS7 and was planning to sell my current motor to offset the cost. Perhaps that's what created the confusion.

 

Nice. Are you're keeping the stock LS7 dry sump?