Motorsports Village

E85 test
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Author:  F636 [ Mon May 28, 2012 9:01 pm ]
Post subject:  E85 test

I tried E85 this weekend and am convinced this fuel can be an excellent alternative to race fuel. The car ran faster overall with the issue being that it kept running faster each run! Normally I would like this but not when I'm looking for consistancy. My combo for the carb is: hp950, quick fuel metering blocks, .150 needle and seats, 30 CC pumps with 45 shooters (might be a tad large).027 hsb, .065 iab, .043 ifr, .80 pvcr, 5.5 high flow pv, 85/95 main jets and yes it still has the stock boosters. ET's went like this: 6.53,6.52,6.51,6.52(lifting),6.49 broke out. Saturday pretty much looked the same, started with a 6.53 and ended with a 6.49. I guess my question would be if the boosters being too small would cause this? This is approximately 1/10 better than race gas with this same carb. Just wanted to post my findings so far with E85.

Author:  Beretta [ Fri Jun 01, 2012 7:49 pm ]
Post subject:  Re: E85 test

No expert here on E85 as I am converting right now but are you logging O2's or EGT's??
I would block the power valve square the jetting and go from there. This is what most of us do for gas
and once the right combo is found for jets etc then install the PV..
Your a 1/10 quicker so you may be close but I think it should repeat better than that...mabe #-o

Author:  F636 [ Sat Jun 02, 2012 1:32 am ]
Post subject:  Re: E85 test

I agree, not liking the consistancy but I already have some ideas. I have no afr meter or log equipment, I use the good old time slip. I think it may be easier to convert my dominator to e85 but I'll eventually get the boosters changed and get back to this 950.

Author:  Ken0069 [ Sat Jun 02, 2012 5:00 am ]
Post subject:  Re: E85 test

Keith jmarkaudio has the tools to install boosters in a 4150 body so when he gets back on here you can contact him and I'm sure he will change them for you when he starts working again.

Author:  Beretta [ Sat Jun 02, 2012 5:50 am ]
Post subject:  Re: E85 test

Nothing wrong with "time slip" tuning as most of us did it for years and some of us still do it =; ..

How big is the motor??

Author:  ajcasini [ Sat Jun 02, 2012 11:54 pm ]
Post subject:  Re: E85 test

I have one of the tools too and can change them for ya.

Where is the et picking up? Is it every increment? Just 1/8 mile? Just 330'? If the boosters are too small which they most likely are it would lean out the top end, thus you jet larger to get more fuel up top this riches the mixture down low and when good air moves in can pick up a bunch down low and carry it up top.

One thing to try is a smaller hsb. Go with a .025 and then try and pulls jet size. This may give you a little less fuel down low and the bleed will help up top to richer mixture.

It most likely won't be right until you change the boosters but this may get ya a little cower until then.

Author:  F636 [ Sun Jun 03, 2012 6:33 pm ]
Post subject:  Re: E85 test

Thanks guys, the motor is a 412 SBC and to be honest it shouldn't be this fast. I'm excited about it to say the least. Its a .060" over 400 with hardblock to the water pump, flat tops, my own porting on the Victor Jr heads, 260/264@.050, .662 lift on 106 ls, and about 2820lbs. Shifting at 6500 nets the best results. I tried going to. 026 mab but didn't drop the jet size so I'm sure it needs the bigger boosters installed. I was thinking a 170 booster but not sure what's available or if maybe a 175 or 180 might be better. The increase is mainly in the 60' but every increment was a little quicker. I have also only been to an 1/8 mile track with the e85. I'll be in touch with one of you two to change them for me, thanks.

Author:  ajcasini [ Sun Jun 03, 2012 6:54 pm ]
Post subject:  Re: E85 test

No problem. Glad to help. I like to put the .170-.178 stepped boosters in them. That will give ya more fuel up top and keep the signal good down low.

Author:  nomad [ Mon Jun 04, 2012 3:47 pm ]
Post subject:  Re: E85 test

We've found the .170 stepped 4150 boosters are just fine.

What you may want to consider is that BLP offers boosters that have been modified in the venturi portion of the booster. I think one is .435 and the other is .450 with various passage diameters. Check thier website. You might also consider the Braswell boosters. These are a little less than the modified ones and also have a larger than stock venturi diameter with various passage diameters. They are also on the BLP website.

Check out the E85 tuneup development thread. Lots of good info over there comparing a few different carbs.

Author:  F636 [ Mon Jun 04, 2012 5:22 pm ]
Post subject:  Re: E85 test

Thanks Bruce, I have been reading over and over and have learned LOTS! Ran into a few issues I needto fix but anxious to get back to this carb on the track. I have some time to get the boosters replaced and get ready to try some things at the track when I'm ready.

Author:  nomad [ Tue Jun 05, 2012 9:07 am ]
Post subject:  Re: E85 test

Your welcome.

I always suggest that these threads and articles be read more than once. While there are some among us here that can grab a concept very quickly and become conversant in the topic I'm not one of them. Multiple reads allow me to get deeper into the subject and pick up things I've missed on previous reads.

Author:  jmarkaudio [ Tue Jun 05, 2012 11:06 am ]
Post subject:  Re: E85 test

One thing to consider is we have seen positive results from cutting down emulsion on our gas carb work. The viscosity difference with E85 seem to want even less, not necessarily in less e-bleeds but in smaller holes. Depending on which carb we have gone as small as .014 in the top hole, up to .022 in the bottom. My Dominators run .018 in the top, plug second, .020 third, and either .0225 or .024 fourth plugging the bottom. There may be a little power tuning for each engine from there, but it has made the combination extremely consistent. I've seen about .02 max ET swing throughout the day, and some of that may be attributed to traction.

Author:  F636 [ Tue Jun 05, 2012 3:25 pm ]
Post subject:  Re: E85 test

Thanks Mark, I'll keep that in mind and try some different setups. Good to see you're back, hope all went well.

Author:  ajcasini [ Sat Jun 30, 2012 10:13 pm ]
Post subject:  Re: E85 test

Get the carb back together yet? When you heading out again?

Author:  F636 [ Mon Jul 02, 2012 12:01 am ]
Post subject:  Re: E85 test

Hi AJ, ya got it together but had to go have my gall bladder removed this morning so waiting to heal up. Ended up being gangrenous and was the most excrutiating pain I've ever had and I had nerve reconstruction done 6 years ago. Next race I'll be able to make is the 21 and 22 as I won't make it next weekend. I'm getting anxious to get this thing out again! Thanks for all your help. I'll post results as soon as I get it to the track.

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