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Title: red motor blowing fuel? Post by: Dave_EH on February 15, 2006, 02:38:12 AM Hi,
As some of you may know I have had my red 6 powered machine on the road for about 5 months now. Over this time I have only covered about 700 miles or so as I am still making asjustments to mechanicals etc. Yesterday I drove it to a workshop before work to get some front end work and an alignment done. My girlfirend followed my over and said that the car was blowing a bit of "clear/white smoke" under acceleration and she could smell fuel (from an airconditioned vz commodore). I haven't seen this for myself yet and I know the timing still needs some adjustment. Fuel economy seems poor, however driving has been too inconsistant to make any assumptions. The previous weekend I took out my plugs and it looked to be running a little lean (spark plugs burned a whitish colour rather than coffee coloured) can anyone help me out? I thinking of taking the car to a place to have a gas anyliser put on it and have the dizzy regraphed. Head is reco so should not be any valve problems - hydraulic lifters - rockers tightened to 3/4 turn past chatter. Specs as outlined below. 179 (192) YT head - porting, large valves, double springs mild cam (approx. 23/63?) electronic dizzy (commodore) holley 350 - 61 jets and 5.5 powervalve all new ignition gear - plugs to 52though (as perscrived by Dr Terry) X2 headers Fuel mixture was turned down till ran rough then turned back up about 1/2 turn. I'm looking forward to some trouble free cruising if anyone can help out! Dave Title: Re: red motor blowing fuel? Post by: FB_MAD on February 15, 2006, 06:48:31 AM Dave. Hard to diagnose without looking at the car but white smoke as you describe may indicate oil consumption (don't panic,most likely something else) although oil burning is usually a white/light blue colour.Smoke from excess fuel being combusted is black (for example too much choke).Don't know if you are running an auto but if it's a Traumatic (Trimatic) then it may be sucking up trans fluid via a perforated vacuum modulator diafragm into the inlet manifold and being combusted which produces a very white smoke but you can smell combusted trans fluid in this case.
Your engine isn't stock so will use more fuel and they tend to be a little fuel inefficient when running in but not normally by a great margin.Diff ratio affects fuel economy/performance as well as driving habits and engine mods. Might not be linked to the white smoke problem but check for perforated fuel pump diafragm.This could be a cause of excess fuel consumption and fuel smell. Could be a myriad of other causes,the above just a few and I'm sure others will add to this. Good starting point would be a dyno tune if possible as actual operating conditions under load can be checked. Hope this info is of use to you and sorry for waffling on a bit.....It's a habit of mine, Terry. |