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Old 11-27-2008, 05:27 PM
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Angle Vs Straight ?

Besides clearance issues are there any other advantages or disadvantages for either? Are their any performance differences? I'm just trying to get a little education on the subject someone at work asked me and I was stumped I told him the only difference I knew of was clearance for headers or manifolds but that was it. He said the angle was for the swirl and spark to meet better? I had nothing to say to him about it after that cuz I just didn't know? Help Plz

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Old 11-27-2008, 06:43 PM
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The position of the plug in the combustion chamber is what's more important. Read this thread >>
performance head question ?
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Old 11-28-2008, 06:30 AM
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So if have an angle plug head and a straight plug head with the same specs as in air flow, the angle plug will make more power and the straight has better efficiency? This is what I am gathering here
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Old 11-28-2008, 08:21 AM
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partial basic explaination for using angled plugs:

http://books.google.com/books?id=mm8...esult#PPA46,M1.....

the spark itself only present for micro-seconds (literally)....

so it's a question of the flame front travel and direction and speed based on the specific chamber/piston void combo "shape".... in the presence of all the turbulance and pressure after the spark event.... to determine plug location and angle to build to max pressure over a specific number of crank degrees versus stroke...

Last edited by red65mustang; 11-28-2008 at 08:30 AM.
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Old 11-28-2008, 01:01 PM
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I think that you will find the opinions equally divided for the Small Block Chevy.

There are so many variables involved,
intake manifold velocity,
carb atomization,
ignition timing,
exhaust scavenging / cam dynamics
piston dome design
chamber swirl at various rpms

If one type were clearly most dominant
then every manufacturer would be making the same style.
Angles do seem to be most prominent.

I don't believe a definitive answer exists. Flip a coin.
Sedan and Red have some good info. thanks

If you look at figure 4-10 you will see why domed pistons don't work as well as people think they should. Do a study on piston domes.

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Old 11-28-2008, 02:41 PM
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Thanks for the link to David Vizards book that has some great info I wish I could afford the whole book. I think I am beginning to understand it a little better. Thanks a bunch guys
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