Using a heat riser to fool TPI when using a large bumpstick!
11-15-2001, 04:57 PM
#1
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Using a heat riser to fool TPI when using a large bumpstick!
First of all, I am new to this board and want to say hello to all of you great people!
I remember seeing some aussy guy adapting a heat riser to an exhaust system creating backpressure to make an over cammed motor user friendly at low rpm, this heat riser of course would open at WOT, any of you have any thoughts on this concept and its application to a TPI engine?
I remember seeing some aussy guy adapting a heat riser to an exhaust system creating backpressure to make an over cammed motor user friendly at low rpm, this heat riser of course would open at WOT, any of you have any thoughts on this concept and its application to a TPI engine?
11-15-2001, 07:11 PM
#2
Senior Member
I don't have a good answer to the question but I'm about 1 hour away from you...Sunrise...right by the Sawgrass Mills Mall!! check out our local f-body club http://www.sffba.com
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Alex A. (aka chevyboy)
1992 Z-28 L98/1LE. Heritage Edition. SLP runners, gutted cats, SLP 3" cat-back & muffler. 3" flo-tech cut-out, SLP TB foil, K&N filter @ TB, 3.23 posi rear.
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Alex A. (aka chevyboy)
1992 Z-28 L98/1LE. Heritage Edition. SLP runners, gutted cats, SLP 3" cat-back & muffler. 3" flo-tech cut-out, SLP TB foil, K&N filter @ TB, 3.23 posi rear.
11-15-2001, 07:21 PM
#3
Supreme Member
Welcome to Thirdgen.org
If it'd work (I'll get to why I don't think it would later) it'd be a mismatch in engine building, IMO.
Reason I say this is that if you had a cam that was large enough to cause drivability issues or emission/ECM issues, you wouldn't be running exhaust manifolds, you'd have headers instead. I guess the idea could be adapted at the collector(s) though.
Now the reason I don't think it'd work is as you increase backpressure, you lose intake vacuum, large cams generally run lower intake vacuum at idle due to overlap.
Ever driven a car witha plugged cat? You'd be doing the same thing, I'd think.
I think the best way around the issue would be variable lifters.
If it'd work (I'll get to why I don't think it would later) it'd be a mismatch in engine building, IMO.
Reason I say this is that if you had a cam that was large enough to cause drivability issues or emission/ECM issues, you wouldn't be running exhaust manifolds, you'd have headers instead. I guess the idea could be adapted at the collector(s) though.
Now the reason I don't think it'd work is as you increase backpressure, you lose intake vacuum, large cams generally run lower intake vacuum at idle due to overlap.
Ever driven a car witha plugged cat? You'd be doing the same thing, I'd think.
I think the best way around the issue would be variable lifters.
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