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10-07-2009, 02:37 AM
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#21
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Senior Member
Join Date: Jun 2009
Posts: 2,509
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It would be so nice to be able to hook up a laptop and see whats going on. The only thing Id try is running colder plugs. its a very cheap and easy try at fixing the problem. Are you OBDI or OBDII by any chance?
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
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10-07-2009, 02:48 AM
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#22
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by Damian
It would be so nice to be able to hook up a laptop and see whats going on. The only thing Id try is running colder plugs. its a very cheap and easy try at fixing the problem. Are you OBDI or OBDII by any chance?
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ODBII. I ordered some cheapy copper colder plugs.
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10-07-2009, 02:51 AM
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#23
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by enkeivette
Benihana, you think too much. Thicker HG = lower comp = 91 only. 
1.8 rockers = more lift = vroom vroom. Duration is changed minimally. I can do the math if you give me the specs, I think. You can also have them run it without any paper work just to see if it will pass before you take it in for reals. |
So the official Adam recommendation is:
Cometic HG drop CR
1.8 Rockers
Retune
?
If I pull the heads, I can also install the set of nifty sodium filled valves I have. Right now I'm 99% sure it still has the truck head valves (remember, these are 4.8L truck heads), which are not sodium filled, so they're a bit heavier and retain more heat.
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10-07-2009, 10:24 AM
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#24
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by BADDASSC6
Brutal got it right for the most part.
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I kept it simple. You know how Vettezuki is 
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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10-07-2009, 11:45 AM
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#25
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Quote:
Originally Posted by Vettezuki
So the official Adam recommendation is:
Cometic HG drop CR
1.8 Rockers
Retune
?
If I pull the heads, I can also install the set of nifty sodium filled valves I have. Right now I'm 99% sure it still has the truck head valves (remember, these are 4.8L truck heads), which are not sodium filled, so they're a bit heavier and retain more heat.
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I think C6 made the recommendation first, but yeah. FelPro or Cometic, whatever is right for what you need. Then buy some used 1.8 rockers and see if it'll pass.
Don't know if you really need another dyno re-tune, I'd just pull the AFR down lower. If I remember right your motor was stoich at WOT. I'd bring it down a point or two, should help the ping prob.
Drop the CR 1/2 a point, colder plugs, more gas in the mix... should run on 91 all day. If you care about that sort of thing. I would def bet the plug fouling was a result of the Torco.
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I <3 forced induction.
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10-07-2009, 12:28 PM
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#26
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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Ben, do you know how much lift your valve springs can take? How about your piston to valve clearance? I wouldn't go installing a set of 1.8 rockers until you know these measurements. If you’re going to replace the head gaskets with thicker ones then you'll gain some piston to valve clearance over what you have currently but you will still want to clay the piston and make sure.
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10-07-2009, 01:32 PM
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#27
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by enkeivette
I think C6 made the recommendation first, but yeah. FelPro or Cometic, whatever is right for what you need. Then buy some used 1.8 rockers and see if it'll pass.
Don't know if you really need another dyno re-tune, I'd just pull the AFR down lower. If I remember right your motor was stoich at WOT. I'd bring it down a point or two, should help the ping prob.
Drop the CR 1/2 a point, colder plugs, more gas in the mix... should run on 91 all day. If you care about that sort of thing. I would def bet the plug fouling was a result of the Torco.
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FYI, current tune equals:
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10-07-2009, 01:41 PM
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#28
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by 94cobra69ss396
Ben, do you know how much lift your valve springs can take? How about your piston to valve clearance? I wouldn't go installing a set of 1.8 rockers until you know these measurements. If you’re going to replace the head gaskets with thicker ones then you'll gain some piston to valve clearance over what you have currently but you will still want to clay the piston and make sure.
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Thanks for the warning. These are comp cam springs, and I *think* they're good for beyond .600 lift, but not positive on the specs.
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10-07-2009, 01:42 PM
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#29
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by BRUTAL64
You guys keep forgetting about quench. Yep, that'll bite you in the ass. Quench should be around .045. Much bigger than that and you're right back to pre-ingition with your lower compression. 
I don't see where that plug was fouled. It had a lot crap on it, but that didn't mean it wasn't firing. I'd have to look at that plug close up. To be sure.  |
I forgot, what's quench again? I'll bring the plugs with me this Saturday. I already ordered a set of copper autolites on the colder end of the spectrum.
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10-07-2009, 01:43 PM
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#30
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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BTW, if I'm running a stock stat, what should I consider going down to???
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