E85 fuel and timing acceleration

Go down

E85 fuel and timing acceleration

Post  fast_fairlane on March 9th 2015, 5:54 pm

Good day,
one of the main benefits of propane is the ability to put 'lighter' springs in the distributor to get more timing earlier in the RPM range. Propane's inherent detonation friendly rating provided this opportunity to get more advance earlier in the RPM range.

Can this same logic be applied to E85 fueled vehicles, with their detonation-friendly fuel?

Thanks

DRM

fast_fairlane

Posts : 2
Join date : 2015-01-19

View user profile

Back to top Go down

Re: E85 fuel and timing acceleration

Post  whatbumper on March 9th 2015, 8:04 pm

Yes, kind of. E85 from our test has around a 95 octane rating whereas propane is in the 100-105 range down here. So e85 has more detonation resistance than regular gas but not propane value.

whatbumper

Posts : 3023
Join date : 2009-11-11
Age : 38

View user profile

Back to top Go down

Re: E85 fuel and timing acceleration

Post  DaveMcLain on March 10th 2015, 8:37 am

Just because a fuel is higher octane and has greater detonation resistance it does not mean that it runs better with more advance.

DaveMcLain

Posts : 360
Join date : 2009-09-15

View user profile

Back to top Go down

Re: E85 fuel and timing acceleration

Post  kim on March 11th 2015, 12:05 pm

alcohol is the best example of Dave's Statement. Because its an oxygenate fuel, the flame travel is faster than comparable octane rated gasoline. ON methanol, peak performance for my engine was 32 degrees timing advance. On 116 race fuel its 34 to 36 degrees total depending on air temp.

kim

Posts : 700
Join date : 2009-06-27
Location : Tucson AZ

View user profile

Back to top Go down

Re: E85 fuel and timing acceleration

Post  Rich Osmond on March 11th 2015, 1:06 pm

X2. The difference in optimum timing requirements has been negligable for the BBFs I have conducted back to back Dyno testing on E85 Vs race fuel. These have been both A460 and SCJ type cylinder heads and all in the 14:1 mechanical compression range.

Rich Osmond

Posts : 216
Join date : 2013-02-03
Location : League City, Texas

View user profile

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum