hotter plugs for 86 vette
Thread Starter
Advanced
Joined: Mar 2010
Posts: 52
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From: choctaw oklahoma
hotter plugs for 86 vette
need a plug a Degree hotter than stock.what shuld i use. for TPI 350? need to burn off a little oil on #7 and #8 pistons
Last edited by reddirtcowboy; Feb 2, 2011 at 04:05 PM.
Racer
Joined: Jul 2010
Posts: 308
Likes: 2
From: Kansas City MO
What are you wanting to know??
Just head to the parts store and ask them for a plug that's one heat range hotter than the factory plug - some use higher numbers for hotter, some lower numbers - going to have to know what brand plug you're using (or just have the parts guy look in the book - there will be a chart in the back with the heat ranges decoded...)
Just head to the parts store and ask them for a plug that's one heat range hotter than the factory plug - some use higher numbers for hotter, some lower numbers - going to have to know what brand plug you're using (or just have the parts guy look in the book - there will be a chart in the back with the heat ranges decoded...)
Racer
Joined: Jul 2010
Posts: 308
Likes: 2
From: Kansas City MO
IIRC for spark plugs:
Autolite, Bosch, Champion - Higher numbers = hotter plug
NGK, Denso - Lower numbers = Hotter plug
Go have them look up a stock plug then when they get the part number of the plug have them go up or down to get a hotter plug (remember most parts stores use a stock number for the plug so they may have to look at the actual plug to get the spark plug's number)
Autolite, Bosch, Champion - Higher numbers = hotter plug
NGK, Denso - Lower numbers = Hotter plug
Go have them look up a stock plug then when they get the part number of the plug have them go up or down to get a hotter plug (remember most parts stores use a stock number for the plug so they may have to look at the actual plug to get the spark plug's number)
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Pro
Joined: Jul 2002
Posts: 729
Likes: 4
From: Yukon OK
Found an interesting web site by NGK with a lot of info about spark plug heat ranges and the reasoning behind them:
http://www.ngksparkplugs.com/tech_su...x.asp?mode=nml
http://www.ngksparkplugs.com/tech_su...x.asp?mode=nml
Racer
Joined: Jul 2010
Posts: 308
Likes: 2
From: Kansas City MO
I'm hoping that he's done the diagnostics and it's not fuel fouled - I'm assuming he's truely treating it as a band-aid for a true oil consumption problem (which at the point it fouls plugs it's gotta be chugging oil at least a quart per fill-up!) and this is really only temporary until the funds allow for a real fix (either valve guides if it's coming from the heads or rings if it's coming from the bottom end - neither which is a quick or cheap fix...)
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
If your plugs (7 & 8) are oil fouled, the hotter plug will not help for long. The problem is a bad intake gasket. A well known Chevy problem for years. Replace the gaskets. Use the Right Stuff and dimple the china wall front and rear of the block.
Thread Starter
Advanced
Joined: Mar 2010
Posts: 52
Likes: 0
From: choctaw oklahoma
it is to get me by for a month or so till i can rebulid it. I'm taking it up to a 383 it sounds like the best way to go. i would like to put out about 450hp to 500hp at the crank
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
IIRC for spark plugs:
Autolite, Bosch, Champion - Higher numbers = hotter plug
NGK, Denso - Lower numbers = Hotter plug
Go have them look up a stock plug then when they get the part number of the plug have them go up or down to get a hotter plug (remember most parts stores use a stock number for the plug so they may have to look at the actual plug to get the spark plug's number)
Autolite, Bosch, Champion - Higher numbers = hotter plug
NGK, Denso - Lower numbers = Hotter plug
Go have them look up a stock plug then when they get the part number of the plug have them go up or down to get a hotter plug (remember most parts stores use a stock number for the plug so they may have to look at the actual plug to get the spark plug's number)
Bosch - higher number = hotter plug
I can only speak about application of DENSO spark plugs. Your stock plug that you have should be a HR16 (in DENSO terms). Therefore you need a 14HR plug if you want to go higher. Unfortunately, DENSO does not produce a 14HR spark plug for the aftermarket.
DENSO heat range #14 is equivalent to #9 for Bosch, #4 for NGK, and #16,14 for Champion.
Hope this helps a bit.
