heard this today... higher octain racing fuel to clean out car????????????

decadude · 08-08-2001, 07:17 PM

was picking up some techtron to clean out injectors. ask the guy there if there was something better. he suggested 103 octain racing fuel. just a 1/4 of a tank or so mixed with regular gas. he claimed the higher octain burns better, hotter and cleaner, and it will clean all he carbon and other build ups in the engine. is this true i wanna try it ????????????

ryoung · 08-09-2001, 12:15 AM

decadude · 08-09-2001, 06:51 AM

WClark · 08-09-2001, 08:20 AM

...race fuel does anything to clean up an engine, however Techron has been proven to reduce injector and valve deposits thru independent testing (BMW owners club sposored the tests I believe).

Paul H. (near Annapolis, MD) · 08-09-2001, 10:27 AM

..I would imagine unless you do something like advance timing (ignite the mixture earlier), or increase compression, you are likely to have unburned fuel using the higher octane mix. Seems to me that incomplete combustion would lead to more carbon buildup, not less.

It is possible that the Bosch ECU can automatically advance your timing enough to take advantage of the higher octane without any unburned fuel, but this has it's limits.

Paul

SteveKen · 08-09-2001, 12:21 PM

Mike O. · 08-09-2001, 05:10 PM

Mike O. · 08-09-2001, 05:11 PM

Augie · 08-10-2001, 05:33 AM

...than racing fuel. In fact, a bunch of unanticipated engineering had to be done when no-lead first became available. Note: I am *not* talking about exhaust valve seats. There were significant problems with exhaust manifold cracks, etc.

Pump gas will also likely have a higher percentage of detergents than racing fuel - and it's the detergents that will clean your engine, not octane. As has already been noted (below), higher octane fuel burns more slowly than lower octane fuel.

I have no idea why this brainless myth won't go away.

decadude · 08-10-2001, 08:04 PM

i know a few people at audi champion and a few car nuts. they mention things to me so i turn and ask you guys for your input. as for the higher octain .......spoke to a guy who works for a fuel company. and guess what he said. some people use higher octain to clean there engines out. i did not tell him that, he came out and told me after we talked about engine built up and the use of tectron injector cleaner. so there must be some reason people do it ???????

08-09-2001, 12:15 AM	#2
ryoung Elder Member Garage is empty, add now Join Date: Mar 2001 Posts: 11,968	Sorry, it's nonsense. __________________ 2001 Audi S8 2007 Toyota FJ Cruiser

08-09-2001, 06:51 AM	#3
decadude New Member Garage is empty, add now Join Date: Jul 2001 Posts: 73	a reason would be greatly appreciated to why this is nonsense??

08-09-2001, 08:20 AM	#4
WClark Member Garage is empty, add now Join Date: Mar 2000 Posts: 3,511	Whatever...I know of no evidence supporting that... ...race fuel does anything to clean up an engine, however Techron has been proven to reduce injector and valve deposits thru independent testing (BMW owners club sposored the tests I believe). __________________ 2001 A4 1.8TQMS, etc. 2001 S8

08-09-2001, 10:27 AM	#5
Paul H. (near Annapolis, MD) Junior Member Garage is empty, add now Join Date: Jul 2000 Posts: 782	Higher octane fuel burns slower, so.. ..I would imagine unless you do something like advance timing (ignite the mixture earlier), or increase compression, you are likely to have unburned fuel using the higher octane mix. Seems to me that incomplete combustion would lead to more carbon buildup, not less. It is possible that the Bosch ECU can automatically advance your timing enough to take advantage of the higher octane without any unburned fuel, but this has it's limits. Paul __________________ ----- 1998.5 A4 1.8T QTS in Pearl White/Ecru (blue dash) 147K miles Mods, etc: Yes. Many things in life will catch your eye, but only a few will catch your heart. Pursue those.

08-09-2001, 12:21 PM	#6
SteveKen AudiWorld Member Garage is empty, add now Join Date: Jul 2001 Posts: 594	I've read that Toluene has a cleaning effect w/ no sensor damage __________________ ___________ 2002 Audi S6 2008 Smart ForTwo Wanted: Complete 4.2L BiTurbo engine, turbos ECU & wiring

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08-09-2001, 05:10 PM	#7
Mike O. AudiWorld Super User Garage is empty, add now Join Date: Mar 2000 Posts: 3,352	ECU can't advance the timing, only back it down __________________ Click on sig for 200,000 mile post

08-09-2001, 05:11 PM	#8
Mike O. AudiWorld Super User Garage is empty, add now Join Date: Mar 2000 Posts: 3,352	decadude, where are you coming up with this logic? __________________ Click on sig for 200,000 mile post

08-10-2001, 05:33 AM	#9
Augie New Member Garage is empty, add now Join Date: Aug 2000 Posts: 237	No-lead pump gas burns hotter... ...than racing fuel. In fact, a bunch of unanticipated engineering had to be done when no-lead first became available. Note: I am not talking about exhaust valve seats. There were significant problems with exhaust manifold cracks, etc. Pump gas will also likely have a higher percentage of detergents than racing fuel - and it's the detergents that will clean your engine, not octane. As has already been noted (below), higher octane fuel burns more slowly than lower octane fuel. I have no idea why this brainless myth won't go away.

08-10-2001, 08:04 PM	#10
decadude New Member Garage is empty, add now Join Date: Jul 2001 Posts: 73	Re: decadude, where are you coming up with this logic? i know a few people at audi champion and a few car nuts. they mention things to me so i turn and ask you guys for your input. as for the higher octain .......spoke to a guy who works for a fuel company. and guess what he said. some people use higher octain to clean there engines out. i did not tell him that, he came out and told me after we talked about engine built up and the use of tectron injector cleaner. so there must be some reason people do it ???????

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