| Author | Message | ||
| Rexrcr (Rexrcr)
New member Username: Rexrcr Post Number: 14 Registered: 11-2002 |
Dan, You can turbo your carb set-up. Yes, they will need to be reworked to exist in a pressurized environment. But with all the exellent aftermarket fuel injection systems and the TWM throttle bodies, if you're going to take the plunge, do it right. Drivability will be superior in every way. A carb set-up is a system of compromises and meters by volume and the engine eats by mass, not volume. | ||
| Hans E. Hansen (4re_gt4)
Member Username: 4re_gt4 Post Number: 533 Registered: 4-2002 |
True, true, hot manifolds are not a good thing. *However*, that is why early US 308s have stainless manifolds, and Euro cars don't. They knew that the smog pumps would heat the manifolds to totally stupid temperatures, and compensated accordingly. Again, agree. Ultra hot manifolds not good. But, not unprecedented, nor not planned for. | ||
| magoo (Magoo)
Advanced Member Username: Magoo Post Number: 3554 Registered: 2-2001 |
Ken, I agree, Like cracked manifolds. | ||
| Robert Ziino (F355bob)
New member Username: F355bob Post Number: 30 Registered: 8-2002 |
I had a Pantera that the headers glowed cherry red once. The ignition was too retarded and was not advancing. This car also had Electromotive ignition. I would check your timing. | ||
| Ken (Allyn)
Member Username: Allyn Post Number: 566 Registered: 10-2001 |
A glowing exhaust system is NOT a good thing. It's not designed that way and I'd advise you to fix what needs fixing or you may find new problems cropping up. | ||
| Kelly (Tifosi1)
Member Username: Tifosi1 Post Number: 494 Registered: 2-2002 |
Dan, Mine does the same thing. It's the test tubes, and It is neat to see them glow. I don't think it is a problem. | ||
| Paul (Pcelenta)
Junior Member Username: Pcelenta Post Number: 213 Registered: 7-2002 |
amerispec in CT...was "re" offering Turbo kits for the carb cars a little while back...you might want to check with them (richard fritz?) I remember that it eliminated the webbers and replaced them with 1 carter carb... | ||
| Ken (Allyn)
Member Username: Allyn Post Number: 564 Registered: 10-2001 |
My Europa did that. First, too rich burns cooler, too lean runs hotter! Also, a backfire on shut down is from too lean as well, NOT from too rich. I made mine a little richer and made sure my idle was 900 rpm (normal for my car)as it was more like 1500. The car ran a lot cooler and no backfire. You can also advance the timing a hair although I didn't. Also, count to 10 at idle before shutting off and it will help eliminate a backfire. | ||
| Philip Airey (Pma1010)
New member Username: Pma1010 Post Number: 47 Registered: 7-2002 |
Maybe heresy if you are planning on keeping the carbs, but there is a group (TWM?) that will convert the Webers to FI. I have no experience of success etc. I do know that the 70s/80s vintage kits (BAE I think) required the carbs to be reworked to handle the force - feeding. | ||
| Paul Wehmer (Pwehmer)
New member Username: Pwehmer Post Number: 9 Registered: 10-2002 |
Adding a turbo to a carb? Sounds difficult since you would be changing the density of the air going into the carb. Much easier to do with an FI system where you can map the air volume & pressure to determine the proper amount of fuel. | ||
| Dan B. (Dan_the_man)
Junior Member Username: Dan_the_man Post Number: 65 Registered: 9-2002 |
Timing is not retarded. initial timing is set correctly, and the electromotive timing advance is working correctly. I have noticed that it is only happening when I let the motor rpm's slow the car down several times in traffic. Thus I think that it is probably leaning out some what and causing this issue. Does anyone have an answer for the turbo question? Thanks, Dan | ||
| magoo (Magoo)
Advanced Member Username: Magoo Post Number: 3547 Registered: 2-2001 |
Dan, Ed makes a good point. Retarded timing will cause the problem. Does your car run hot at times. This also would be a indication of the timing being retarded. | ||
| Edward Gault (Irfgt)
Intermediate Member Username: Irfgt Post Number: 2277 Registered: 2-2001 |
Retarded timing can also contribute to this condition. | ||
| Hans E. Hansen (4re_gt4)
Member Username: 4re_gt4 Post Number: 508 Registered: 4-2002 |
No experience with cars w/the heat shield, but maybe they are insulated well enough that they retain enough heat to cause a glow. BTW, the AIR fittings are on the head. The ones in the manifold are for the probes used to tune/set the mixture. You should have a set of pipes in your tool kit that screws into these ports. | ||
| Dan B. (Dan_the_man)
Junior Member Username: Dan_the_man Post Number: 63 Registered: 9-2002 |
My 308 does run rich, and I do have the heat shields on and I do not have the smog pump, (you can see the A.I.R. pipe fittings through the holes in the shield, this is where I am seeing the manifold glowing). I have only noticed this when I am in traffic and letting the engine rpm's decelerate. After my long commute to work the other evening, I checked and they were not glowing. I am wondering if when I let the rpm's slow the car down if I am experiencing a leaning effect. maybe after several times in traffic it is generating enough heat to glow the manifolds. Also, I am considering adding a turbo, what is the standard thing to do to increase the fuel delivery on the carb'd 308's for turbo? Is it possible to re meter the carb's for enough fuel or will I have to do something diferent? | ||
| Hans E. Hansen (4re_gt4)
Member Username: 4re_gt4 Post Number: 501 Registered: 4-2002 |
Paul: We've got to meet sometime. Dan: Are your manifolds 'naked'? I.e. are the headers w/o the big heat shields? Either way - With heat shields, I'd say you have MAJOR problems. W/o heat shields: hmmm... I've never noticed that. (Mine are 'naked') Your mixture may be wrong - too lean causes hot combustion, way too rich and you have fuel burning after leaving the cylinder. Also, ignition probs can cause unburned fuel to enter the manifold only to be ignited. (Oh, BTW, you didn't mention smog/AIR pumps - if you have them, exhaust temps will be some 1000 deg hotter than w/o. Try taking the belt off if this is the case.) | ||
| Joe Craven (Rscapri2600)
New member Username: Rscapri2600 Post Number: 11 Registered: 7-2002 |
I was having some transmission trouble a while back on my 83 Winnebago 23' Chieftan RV with a 454 V8. I took off my engine cover so I could drive the motor and look down to check if anything was obviously wrong. The RV had a set of stainless steel headers and it recently passed a CA smog check and it was running well. I drove up to about 75mph and I was surprised to see the headers glowing a fairly bright red. | ||
| Paul (Pcelenta)
Junior Member Username: Pcelenta Post Number: 211 Registered: 7-2002 |
Rob wrote "Backfiring and shooting flames out the back is also from being a little rich I think." In college it was attributed to drinking too much and a bic lighter ...  the '78 is running a little rich | ||
| Rob Lay (Rob328gts)
Board Administrator Username: Rob328gts Post Number: 2774 Registered: 12-2000 |
Loss of any power? When I lost a bank, then they glowed with the raw fuel. You might just be running a little too rich. Backfiring and shooting flames out the back is also from being a little rich I think. | ||
| Paul (Pcelenta)
Junior Member Username: Pcelenta Post Number: 210 Registered: 7-2002 |
my 78 gts is similiar...no cats,euro ansa,crane ignition..slightly bigger carb jets...never a glow...but I have been know to shoot little flames out of the exhaust on shut down. | ||
| magoo (Magoo)
Advanced Member Username: Magoo Post Number: 3543 Registered: 2-2001 |
Dan, I have a 79 308GTS US just as you noted above except electronic ignition. It sounds like there is a excess of raw fuel being dumped into the system from your carbs. I have never had that problem. | ||
| Dan B. (Dan_the_man)
Junior Member Username: Dan_the_man Post Number: 62 Registered: 9-2002 |
I noticed the other night that my exhaust manifolds were glowing some after driving. I tend to drive in 2nd and 3rd gear in town which keeps my rpm's above 3000. It is not a bright glow, but a glow still the same. do you guys see this alot. Any other car this would send up a red flag, but on a Ferrari I'm not sure. 1979 308 gts, US version, no cat's, no turbo, no supercharger, Electromotive ignition |