Straight or angled plugs?
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 3,921
Likes: 2
From: York PA
Straight or angled plugs?
I am going to be purchasing a set of AFR heads and Thorley headers. Should I get the straight, angled, or L98 angled plugs? Is there any performance difference and do any of them need the special plugs to clear the headers?
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: Straight or angled plugs? (stickboy)
It depends on what headers you've got. My Canfields have angled plugs and my Hedmans wouldn't work with them. I had to switch to Dynomax. I think that the angle is supposed to put the spark in a more optimum space in the combustion chamber. I'm sure someone will chime in and tell us exactly what the angled heads do.
Drifting
Joined: Apr 2002
Posts: 1,720
Likes: 19
From: Manhattan Beach Ca
Re: Straight or angled plugs? (stickboy)
I've got DT headers and a couple of the plugs you cant get socket on and have to use wrench on my stock heads. If angled down much better. I can check which one exactly.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Re: Straight or angled plugs? (stickboy)
Seems most guys are buying headers that about dont fit a vette too well,,...can't do steeroids, or much else, will not fit angled plug heads....whatall....allways some excuse....
I highly recommend the Schoenfeld Headers #151, as they fit the car, take any mods in mind, fit any plug/angle....and the WORK....
they cheap too at about 150 bux at your door....
get them coated if you want, locally....
GENE
I highly recommend the Schoenfeld Headers #151, as they fit the car, take any mods in mind, fit any plug/angle....and the WORK....
they cheap too at about 150 bux at your door....
get them coated if you want, locally....
GENE
Le Mans Master
Joined: Oct 2000
Posts: 8,897
Likes: 1,356
From: Santa Ana CA
Re: Straight or angled plugs? (stickboy)
I have Thorely headers on my '64 with straight plug camel hump heads and no problems with fit or plug removal. Can't offer advise on angle-plug fitment.
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
Re: Straight or angled plugs? (stickboy)
The marginal performance gains of angled plugs can be simulated with straight plugs by triming the plug end a little and then bending the remaining portion to gap specs. This mod lets the spark arc to the side of the plug tip instead of to the top.
The whole idea of angling is to expose more of the spark to the A/F mixture. :cheers:
The whole idea of angling is to expose more of the spark to the A/F mixture. :cheers:
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Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Straight or angled plugs? (marshrat99)
I only use angle plug heads. Yes they only work with certian headers. Most quality headers are fine, but if in doubt call your manufacturer first.
Angle plugs have quite a few good points: The plug is placed in the cylinder for better flame travel. So you can use less octane with a given compression ratio. Faster more complete fuel burn. They use the deep 3/4 inch reach plugs for more correct plug heat and positive thread seal.
Angle plugs have quite a few good points: The plug is placed in the cylinder for better flame travel. So you can use less octane with a given compression ratio. Faster more complete fuel burn. They use the deep 3/4 inch reach plugs for more correct plug heat and positive thread seal.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Straight or angled plugs? (marshrat99)
"The marginal performance gains of angled plugs can be simulated with straight plugs by triming the plug end a little and then bending the remaining portion to gap specs. This mod lets the spark arc to the side of the plug tip instead of to the top. "
I don't think that I would go quite this far. Small gains can be made by indexing standard spark plugs. I also believe that 4 tip spark plugs are the best. For that matter I only use platium plugs. I never worry about them.
I don't think that I would go quite this far. Small gains can be made by indexing standard spark plugs. I also believe that 4 tip spark plugs are the best. For that matter I only use platium plugs. I never worry about them.
Safety Car
Joined: Feb 1999
Posts: 3,631
Likes: 14
From: Fountain Hills AZ
Re: Straight or angled plugs? (stickboy)
I have Doug Thorley's and they would not work with Trick Flow angle plug heads without cutting a bunch of metal from the flange. Not all angle plug heads are the same though so your best bet is to ask AFR what works and doesn't work with theirs.
Melting Slicks
Joined: Jun 2002
Posts: 2,844
Likes: 99
From: Orrtanna Pa.
Re: Straight or angled plugs? (Vetterodder)
Most cars I've seen at the Vette shows that had headers were running either stock heads or had straight plug aftermarket heads.When I baught my AFR 195's I went straight plug because of this,and the fact I couldn't get a straight answer from anyone.Lots of Hooker sidemounts also running straight plug heads too,which is where I may be headed with mine some day.
BTW my Hooker Comps fit like a glove. :yesnod:
BTW my Hooker Comps fit like a glove. :yesnod:
