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  Feedback on my carb testing for my SB and one question

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Author Topic:   Feedback on my carb testing for my SB and one question
Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 08-30-2002 11:00 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
OK.....After junking the EDEL 600 (1405)I ordered a Holley 750 w/ vaccum and installed an old 600 double pumper in the meantime. It worked terrific. Gave me the most impressive accelerations ever. Mileage was 16.5 mpg, not too bad
The 750 is a little more sluggish on secondaries opening and may require some fine tuning (power valve). I don't know if I am going to bother with that !
Anyway, I was so happy with the 600DP's performance that I am probably going to buy a new one.
Question: Can I go with a 650DP (the engine is middly built up, big alum heads and medium cam) or should I stick with a 600DP ? In other word, is there a chance that the 650 may be too big ?

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Ryan Wilke
Gearhead

Posts: 1539
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 08-30-2002 11:25 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
Pierre,
I'm not familar with what you have in/on the rest of your car.

What intake are you using?
What are you running an Auto or Manual trans?
What rearend gear ratio do you have in it?
Is mileage an issue?

Ryan

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indyphil
Gearhead

Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002

posted 08-30-2002 11:27 AM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
There are some great ways to calculate CFM needed for an engine, www.ponycarb.com has some calculators for your problem.

Didnt the Hipo engine come with a 600cfm?
I think the shelby HiPo cars went to a 750cfm. I bet you can get anything in between to work well too.

Most important is what RPM range you run the engine at.

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 08-30-2002 11:45 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
Thanks guys, here are some more input:
RPM use: 1500-6500 (I like to cruise when wife/kids are on board and ride like a mad man by myself )
Intake: performer RPM
Heads edel 2.02/1.60 alum
cam: 214/[email protected], lift 472/496
Manual T5
rear end 3.5 , locking
I don't want to drop below 15mpg when cruising

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 08-30-2002 11:55 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
700 DP!

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 08-30-2002 12:09 PM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
Alex, are you teasing me again ? + 4$ a gallon is kinda steep for my budget!!

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Ryan Wilke
Gearhead

Posts: 1539
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 08-30-2002 05:19 PM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Pierre:
OK.....After junking the EDEL 600 (1405)I ordered a Holley 750 w/ vaccum and installed an old 600 double pumper in the meantime. It worked terrific. Gave me the most impressive accelerations ever....The 750 is a little more sluggish on secondaries opening and may require some fine tuning...I was so happy with the 600DP's performance that I am probably going to buy a new one.
Question: Can I go with a 650DP (the engine is middly built up, big alum heads and medium cam) or should I stick with a 600DP?...

Pierre,
If I'm hearing you correctly, you already have an old 600DP (which you seemed fairly happy with) and a new 750 w/Vac 2ndaries (which seemed sluggish to ya), right?

If that's so - then what I think I'd do is run the new 750 you already have, but install a lighter spring in the vacuum can; so the 2ndarys come in quicker.... I'd say your "package" (heads, intake, cam, trans, rear gear, etc.) will work just fine with that new 750, it just needs alittle tuning!!!

Just my 2 cents -- Good Luck!
Ryan

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Calcat
Journeyman

Posts: 75
From: Los Angeles, CA
Registered: Feb 2002

posted 08-31-2002 02:04 AM     Click Here to See the Profile for Calcat   Click Here to Email Calcat     Edit/Delete Message   Reply w/Quote
Pierre - what you actually experiencing is called "crisp acceleration" This is a direct result of the smaller venturis in the 600. If you like it stay with the smallest cfm that will adequately feed your engine through your driving range.

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 09-02-2002 02:35 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
Thanks guys for these inputs. Seing the various opinions, I take it that there are no absolute truth in the matter, just a matter of personal taste & approach.....
Thing is, living in Europe really S**** when it comes to getting US autoparts. I wish I could just go to the autoshop around the corner and get a lighter spring !!
So.....
Can I buy a set of springs (for 750VS) ?
Or can anyone tell me the spring number that I should try (that will be lighter than the stock one)? I would rather order a carb that I know will work rather than place several spring orders !!
ThanX again

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Ryan Wilke
Gearhead

Posts: 1539
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 09-03-2002 12:37 PM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Pierre:
...living in Europe really S**** when it comes to getting US autoparts. I wish I could just go to the autoshop around the corner and get a lighter spring !!
So..... Can I buy a set of springs (for 750VS)? Or can anyone tell me the spring number that I should try (that will be lighter than the stock one)?...

Pierre,
Although I live in the US, my local auto parts store wouldn't have the spring kits on the shelf either...but I could order them & you can too - from a number of mail order outfits such as Jegs.com or Summitracing.com. Check out this site - I think this may be what you're looking for - then order it up from your favorite mailorder supplier:

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSCA/20-13.html

Good Luck! Ryan

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 09-04-2002 04:13 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Ryan Wilke:
Pierre,
Although I live in the US, my local auto parts store wouldn't have the spring kits on the shelf either...but I could order them & you can too - from a number of mail order outfits such as Jegs.com or Summitracing.com. Check out this site - I think this may be what you're looking for - then order it up from your favorite mailorder supplier:

http://www.holley.com/HiOctn/ProdLine/Products/FMS/FMSCA/20-13.html

Good Luck! Ryan


Exactly what I was looking for, thanks to all of you for your great inputs

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