samneric Posted July 4, 2007 Share Posted July 4, 2007 Faulty HAI motor wasn't holding a vacuum and letting hot air into the carb on startup.... These later year carbed cars are fascinating to me I remember my old '78 Ford Escort which drove off a throttle cable turning a butterfly valve letting more air into the mix.... That was it! Those EPA regulations certainly threw a spanner -er wrench in the works. The solution of numerous mechanical carb choke levers and vacuum driven bits and bobs is definatley intriguing.... I hope they all keep working for a while longer I'm begining to understand a little more of what lies behind the decision to move towards computer controlled fuel injection - definately cuts down on the number of springs, sprockets and gizmos surrounding the good old carb throttle and (if you were lucky automatic) choke plates... Steve Quote Link to comment Share on other sites More sharing options...
aba4430 Posted July 4, 2007 Share Posted July 4, 2007 In my opinion, the system is supposed to let in hot air during cold start-up........ Anyways, happy you got your issue resolved. Quote Link to comment Share on other sites More sharing options...
Skip Posted July 4, 2007 Share Posted July 4, 2007 "vacuum driven bits and bobs is definatley intriguing...." Having the pleasure??? of working on some late eighties Honda's The magic black box on the bulkhead had some serious framous-dingles inside and about thirty (30) vacuum lines to it. There should be a thermo-switch in the aircleaner to control the "furnace". It was reported that the carb jets are tuned to provide the proper mix when the air temp going in is 100 deg F. As we know, air density (02 content) is a function of temp. Quote Link to comment Share on other sites More sharing options...
samneric Posted July 4, 2007 Author Share Posted July 4, 2007 In my opinion, the system is supposed to let in hot air during cold start-up........ Anyways, happy you got your issue resolved. Sure, bad English - my bad. I had been juggling around with the grammar and for some reason that sounded like the right sentence to land on Lemme try again.... "Faulty HAI motor wasn't holding a vacuum hence not letting hot air into the carb on startup...." There we go! Quote Link to comment Share on other sites More sharing options...
samneric Posted July 4, 2007 Author Share Posted July 4, 2007 Having the pleasure??? of working on some late eightiesHonda's The magic black box on the bulkhead had some serious framous-dingles inside and about thirty (30) vacuum lines to it. Damn, now THAT sounds like fun! Lots of doo-haa's to firckle with there! There should be a thermo-switch in the aircleanerto control the "furnace". It was reported that the carb jets are tuned to provide the proper mix when the air temp going in is 100 deg F. Yeah, Haynes mentioned that the thermo valve regulates the air temp to 100-130 F (think?) so even when the engine reaches running temperature, the exhaust duct valve is constantly adjusting to maintain those inlet air temperatures. As we know, air density (02 content) is a function of temp. Not sure about math functions - I'm a programmer so my concept of the word goes more like: Let variable = Function_Name(parameter list). Applied to our world of engines (now this IS gettting fun ): Let liAirDensity = lcSizeOfAirIntake ' e.g. liAirDensity = 100 Let liAirDensity = Adjust_Air_Density(liAirDensity, Get_Ambient_Temperate()) ' liAirDensity = 90 (its damn warm down here!) Let liAirDensity = Adjust_Air_Density(liAirDensity, Stuff_Air_Through_Intercooler(liAirDensity)) ' liAirDensity = 200 ! Damn! Let liAcceleration = Make_Car_Go(liAirDensity, Add_Fuel()) Damn, liAcceleration is an amazing 0-60 in 5.6 seconds! Just imagine if we took the "Stuff_Air_Through_Intercooler" Function out... Now liAcceleration is now a measly 0-60 in 12 seconds.... Or if I think I have the idea down right (without the archaic DOS Basic!).. The colder the air molecules - the smaller they become: the more you can get in the chamber: the more fuel you can add without the mixture becoming too rich: the bigger the explosion: the more force pushing on the piston/conrod/crankshaft: We go DAMN fast indeed! Steve Quote Link to comment Share on other sites More sharing options...
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