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five7kid
Joined: 21 Jun 2007
Posts: 12
Location: Littleton, CO
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 Posted: Thu Jun 21, 2007 12:15 am Post subject: Just discovered you guys (carburator conversion tips) |
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I was led here from another BB. Thought I'd say hello.
I'm using E85 in my weekend warrior in the sig. Started last season, tried gasoline this year when a couple of things piled up on me, severely regret that and am now back on the squeezin's.
Just filled up my two 5-gallon jugs at Silco Conoco at Broadway & Alameda today for $2.399. Last summer their price was $1.999.
The station closest to me, the Shell on Alameda west of Union, has let the price float with regular unleaded. Can't wait for some competition to open up to bring them down.
If anyone has specifics for idle bleed and power valve restrictor sizes for E85, I'm all ears. Don't have precision drill bits, don't feel like paying $100 for them, either.
(edited the title to help future searches on carburator conversion steps)
Larry - moderator
_________________
'57 Chevy, w/396, XS282S cam, RPM intake, 750 Holley/Proform/QFT DP. TH400 w/3500 stall, 3.73 gears. Converted to E85 in '06. Runs low-13's at 5800' elevation. 2004 Summit ET Sportsman Div 5 champ, nat'l runner-up, 2006 Div 5 semifinalist. |
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hotrod
Joined: 19 Apr 2005
Posts: 872
Location: Colorado
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| Posted: Thu Jun 21, 2007 12:08 pm Post subject: |
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Welcome aboard!
You should be able to find all the info you need here on this forum and a couple other E85 specialty forums.
There are several posts where folks discribe the changes they made to carburated systems to get them dialed in on E85.
If you just want a plug and play solution there are specialty carburators starting to come out already jetted and setup for E85.
Larry |
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five7kid
Joined: 21 Jun 2007
Posts: 12
Location: Littleton, CO
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| Posted: Thu Jun 21, 2007 2:12 pm Post subject: |
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Thanks for the welcome. I've seen you in several threads I've looked over. Where do you race?
I've looked over several carb threads and searched, but haven't found specifics on the idle & PV restrictors, or emulsion holes. I've seen the Quick Fuel E85 carb, a bit pricey but tempting; I'm not impressed with Edelbrock carbs in general, no reason to believe I'd like their E85 version any better for my application.
I have the Proform main body & billet metering blocks, the instructions that came with the blocks said to call QF for tuning info & parts. Main problem I'm having is primary idle quality - interestingly the secondary idle seems to work well.
_________________
'57 Chevy, w/396, XS282S cam, RPM intake, 750 Holley/Proform/QFT DP. TH400 w/3500 stall, 3.73 gears. Converted to E85 in '06. Runs low-13's at 5800' elevation. 2004 Summit ET Sportsman Div 5 champ, nat'l runner-up, 2006 Div 5 semifinalist. |
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hotrod
Joined: 19 Apr 2005
Posts: 872
Location: Colorado
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| Posted: Tue Jul 03, 2007 5:08 pm Post subject: |
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I have not been active for a couple years but was drag racing the car (wrx) up at Bandimere's when I first started playing with E85. (very low 13's at 103)
I have never been a big fan of the Holleys, always had better luck with the old style AFB. I never could get the Holley's to cold start with out wrestling with them for weeks but the AFB's were very well mannered for a daily driver including cold winter weather.
I've seen some posts that specify the changes needed but would have to go do some digging to find them.
I've heard good things for the TBI setups to replace carburators so you might want to look into those. That gives you the simplicity of a basically bolt on replacement for the carburator but the flexibility of a programable setup like EFI to tune without juggling jets and drilling metering holes and all that that goes with the conventional carburators.
http://www.aedperformance.com/New%20Components.htm
http://www.quickfueltechnology.com/catalog_new_files/QFT%20Catalogue%20of%202007.pdf
| boosted A-body wrote: | http://www.innovatemotorsports.com/forums/archive/index.php/t-4770.html
boosted A-body
10-15-2006, 10:59 AM
Eric, I converted my car(twin turbo SBC) to E85 last April, has soon has they started selling it near my house. I started out jetting up the mains and the PVCR 27% from were I was with gas. That got me in the ballpark. After some tuning and a day at the dyno I ended up about 29% more on the mains and 31% on the PVCR. That made the best power at a Lamda of 0.83-0.86, or about 12.26-12.69 A/R reading the LM-1 on the gas settings. I also upped the IFR from .031 to .035 to help low end drivability. The car already had a aftermarket fuel system on it consisting of Aeromotive pump and regulator with Aeroquip lines. I contacted both companys and both are alcohol compatable. The only other mod I did to the carb was up the pump squirters on both ends to 45's. I already had 50cc pumps on it. Overall it was to easy and well worth it. The car loves the stuff and runs like a champ on it. |
| d100 wrote: |
See thread for full discussion:
http://speedtalk.com/forum/viewtopic.php?p=10430&sid=e636a38f7ac34b6162304cc6596270c4
Posted: Sat Aug 27, 2005 12:42 pm Post subject: need carb tuning help Reply with quote
I've got a 850 holley double pumper that I'm running on E85,(15% gas,85% alcohol). I've jetted it up 35% over the gas baseline, 88's&86's. I've opened up the idle feed restrictions .004, installed the 50cc accelerator pump kit on the primarys with the brown cam supplied. I also installed the large cream colored cam on the secondaries. I've tried #37 squirters, #40's and a set I drilled to .055. The motor idles with 12" of vacuum and am running 6.5 power valves front and back.
I've got a bog or stumble when I nail the throttle from idle or low speed. The #40 squirters so far cause the least stumble. Need some ideas on pump cams and or squirter sizes to try.
The rest of the motor is as follows, dodge 440, 11.2-1 compression, 452 home ported iron heads, small solid cam, .496I, .518E, duration @.50 is 239/246, 110 center. M1 single plane, 1-3/4" headers. Timing is 38 degrees at 650rpm along with 10 degrees in the vacuum advance can. 4000rpm stall, 4.10 gears.
It idles and drives as good as any gas motor I've run, just the stumble when I stab it. Is it squirters& pump cams that need attention or am I overlooking something else? Dave
Bill and Jesse; I unhooked the secondaries and took a spin in it on my semi-private drag strip,(440 Street SW,Really). It bogs, stumbles when you quickly flat foot it. I tryed the #40 squirter and a #55. The #55 does more of a stutter and then catches rather than almost die before it picks up. The 55 was a long tube squirter, tryed it again with and without the vacuum advance, no difference. The venturi/float/rpm test will have to wait until tommorrow, it ran out of fuel in the garage.
Jesse; I've got 50cc pumps on both front and back, the cams are the biggest most aggressive ones, big brown cam in front, big cream colored one on the secondary. I tried the smaller ones and kept going up. The idle and cruise I believe are on the money.
I'm pretty sure I have to open the PVCR's up, but how much? I have to go back in it to be sure but I think they are .051 now.
I wish you didn't live half way across North Dakota you'd have a tough time getting rid of me when you had the dyno fired up. And you and the wife and kids would be getting fat on spuds. Dave
Check ball is OK, fuel comes out at the slightest touch of the throttle.
After talking with you on the phone this afternoon Jesse I went out and jetted up 4 sizes and tryed it, no improvement. I then went up another 4 sizes to 96's and it started coming around, just a little hesitation. I went back and jetted it up to 98's pri, 96's sec. and hooked up the secondaries and installed #40 squirters front and back. It still stumbled a bit but I haven't touched the rear metering block. I think it would have worked nicely if I had. I guess this means open up the PVCR's. I'll call Holley in the morning about it.
On a side note, when I stood on it at 40mph on warm clean blacktop the rearend wanted to come around on me, it just Roasted the tires. Dave
Edit; I called holley tech line and the guy at the other end said the alky carbs had a PVCR of .118. I guess I've got a lot of 'sneaking up on it' room. Dave
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Larry |
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hotrod
Joined: 19 Apr 2005
Posts: 872
Location: Colorado
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five7kid
Joined: 21 Jun 2007
Posts: 12
Location: Littleton, CO
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| Posted: Sun Jul 08, 2007 8:39 am Post subject: |
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Oh, I'm quite familiar with that thread. If you look carefully, you'll see a familiar username, and a link to this Board. 
_________________
'57 Chevy, w/396, XS282S cam, RPM intake, 750 Holley/Proform/QFT DP. TH400 w/3500 stall, 3.73 gears. Converted to E85 in '06. Runs low-13's at 5800' elevation. 2004 Summit ET Sportsman Div 5 champ, nat'l runner-up, 2006 Div 5 semifinalist. |
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hotrod
Joined: 19 Apr 2005
Posts: 872
Location: Colorado
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| Posted: Sun Jul 08, 2007 4:37 pm Post subject: |
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Ooops ---- did not catch that ! Doing search for other info at work so not much time to do more than scan for content.
Still a good thread for others to look at!
Larry |
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five7kid
Joined: 21 Jun 2007
Posts: 12
Location: Littleton, CO
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| Posted: Sun Jul 08, 2007 4:50 pm Post subject: |
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True enough.
_________________
'57 Chevy, w/396, XS282S cam, RPM intake, 750 Holley/Proform/QFT DP. TH400 w/3500 stall, 3.73 gears. Converted to E85 in '06. Runs low-13's at 5800' elevation. 2004 Summit ET Sportsman Div 5 champ, nat'l runner-up, 2006 Div 5 semifinalist. |
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