Originally Posted by DaleTx (Post 459313)

I have used a couple of the Holley HP carbs in the past on 350 small blocks. After reading the posts on your carb settings I went out and checked the settings on my carbs. The Holley 650 HP with mechanical secondarys that I ran on the Camaro had the idle mixture screws at ¾ turn out. The Holley 750 HP I ran had the Idle mixture screws out 1-1/4 turn.

The pump discharge nozzle I used on the 650 HP was .029 on the primary and .031 on the secondary. The fuel pressure was 5 psi for the tune. I tried a higher pressure fuel pump one time (7.5 psi) and it threw the tune off. The carb was very sensitive to the pressure change.

I agree with Greg about dialing in the tune on the chassis dyno… saves a lot of time and you get to see the results of the changes on a graph. It’s also fun to stand back and watch your car all wound up.

:thumbsup:

Originally Posted by Flash68 (Post 459334)

:sieg:

I just noticed this new emoticon is labeled "Sieg"... :lol: :lmao:

Originally Posted by compos mentis (Post 459340)

Sieg ain't no dummy...he came up with a plan where he only gets charged $.01 when someone uses it, but when he does, it's free. :thumbsup:

Originally Posted by Sieg (Post 459382)

What idle air bleed jets were in this carb? Mine has 70's but the unknown factor (to me) is the impact of the idle bypass system in the baseplate. Holley says it does not impact other circuits.......but it does impact the tune.......especially if trying to compare to you 4150 :headscratch:

Look at the features on this page to see some of the changes: http://www.holley.com/0-80802HB.asp

Even though it may bore you now that you're into techie-tuning. :mock:


NEVER! It's got a motor and wheels!

In the backyard:
http://sieg.smugmug.com/Motorcycles/...G%209562-M.jpg

Originally Posted by DaleTx (Post 459410)

The idle air bleeds in my 650 HP are 68's.

Using squirters, springs, cams, floats, power valves, jets, and such seems so primitive and old fashioned....Lol.

These days I call my tuner, we plug in the lap top, push a few buttons and I'm good to go. Seriously the new stuff is awesome :mock:

Nice form on the trials bike :thumbsup:

Originally Posted by Sieg (Post 459416)

Thanks for checking the bleeds. :thumbsup:

What happens when you can reach your tuner and you have a corrupt map? :popcorn2: :mock: :popcorn2:

Don't have much talent on the trials bike but I really enjoy it. :thumbsup:

Originally Posted by Vince@MSperfab (Post 459430)

am I the only one that tunes by ear, butt and vac gauge?
I have never worried about turn count.

Fetch a decent idle around 800, or till you read 0 hg at the venturi port. Register a slight idle circuit from the secondary blades. Turn the mixture screws in till you detect idle change then back out 1 turn. Then Butt tune the accel pump cams and squirters.

Originally Posted by Sieg (Post 459382)

In the backyard:
http://sieg.smugmug.com/Motorcycles/...G%209562-M.jpg

Originally Posted by Vince@MSperfab (Post 459430)

am I the only one that tunes by ear, butt and vac gauge?
I have never worried about turn count.

Fetch a decent idle around 800, or till you read 0 hg at the venturi port. Register a slight idle circuit from the secondary blades. Turn the mixture screws in till you detect idle change then back out 1 turn. Then Butt tune the accel pump cams and squirters.