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Old 05-09-2015   #11
HAWAIIZR-1
 
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Default Re: Sneak Peek from LPE

Can't wait to hear more about this.....
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Old 05-10-2015   #12
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Default Re: Sneak Peek from LPE

Quote:
Originally Posted by A26B View Post
Notice, there are no injector housings.
SO what changed, other than the obvious heads and injector housings?

is the bottom end the same? that looks pretty cool..
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Old 05-10-2015   #13
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Default Re: Sneak Peek from LPE

That plenum looks exactly like the plenum on the prototype Gen II LT5.

Look at the pics in this thread. Looks identical.

http://www.zr1.net/forum/showthread.php?t=13842
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Old 05-10-2015   #14
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Default Re: Sneak Peek from LPE

That is because it is the gen 2 prototype
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Old 05-10-2015   #15
LGAFF
 
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Default Re: Sneak Peek from LPE

Its the same engine


Looks like the injector is a straighter shot to the valve too



Big question....were these heads one off weld ups for the change...or is there a casting out there somewhere?
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Old 05-11-2015   #16
grahambehan
 
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Default Re: Sneak Peek from LPE

Quote:
Originally Posted by XfireZ51 View Post
Graham,

Any change in plenum volume from the original? Also, obviously going w single blade TB. What were the thoughts on that?
Plenum volume similar, it was intended to be electronic throttle, hence one blade.

Prototype tooling existed, no weld up, as to any more

Graham.
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Old 05-11-2015   #17
WydGlydJim
 
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Default Re: Sneak Peek from LPE

Quote:
Originally Posted by grahambehan View Post
Plenum volume similar, it was intended to be electronic throttle, hence one blade.

Prototype tooling existed, no weld up, as to any more

Graham.
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Old 05-11-2015   #18
XfireZ51
 
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Default Re: Sneak Peek from LPE

Quote:
Originally Posted by grahambehan View Post
Plenum volume similar, it was intended to be electronic throttle, hence one blade.

Prototype tooling existed, no weld up, as to any more

Graham.
So is it safe to assume that original plenum volume was not THE restriction to producing further hp/tq?
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Old 05-11-2015   #19
grahambehan
 
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Default Re: Sneak Peek from LPE

Quote:
Originally Posted by XfireZ51 View Post
So is it safe to assume that original plenum volume was not THE restriction to producing further hp/tq?
For a stock displacement engine, absolutely not, for larger displacements it is some limitation but not the main restriction. Typical rule of thumb, plenum volume should be at least engine displacement.

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Old 05-11-2015   #20
XfireZ51
 
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Default Re: Sneak Peek from LPE

Graham,

Its interesting to note the approach GM and Ford took with similar motors at nearly the same time. I'm referring to the LT-5 v Yamaha SHO. The SHO had a "split" plenum approach and the "bundle of snakes" runners for low and high rpm operation. Was that something Lotus/Chevy had looked into?
Hope you don't mind the queries.
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