more carburator on 18 degree 406 cui sbc
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more carburator on 18 degree 406 cui sbc
Hi
I have a 18 degree smallblock with a hogan sheetmetal intake with 2 demon 750 cfm with 850cfm baseplate (just find that out)
the heads are brodix 18C heads weldtech cncported 2.18 1.625 titanium valves jesel 1.6 int 1.55 exh
flow 352 intake 700 lift 245 exh ,700 lift
cam is 114 lobe sep 110 inteke centerline
@0.50 282 in 294 exh dur ( yes the cam is about 10 degees wrong )
765 lift int 735 lift exh
( yes have degree the cam )
i did dyno tested the engine and it was making 768 horsepower on 7500 rpm
messured one carb on dyno it was flowing 495 at wot
so the engine was taking about 990 cfm
i was thinking if i am ported the heads with more flow to about 375-380 cfm on intake 265 cfm exh
changing cam with the new ported heads
can dual 1050 dominator carburators suport this
thinking.. with 0.5 vacuum the 2 dominators will flow about 1212 cfm with the sheetmetal intake
it dosnt mather if it will rev about 8000-8500 rpm
Thanks
I have a 18 degree smallblock with a hogan sheetmetal intake with 2 demon 750 cfm with 850cfm baseplate (just find that out)
the heads are brodix 18C heads weldtech cncported 2.18 1.625 titanium valves jesel 1.6 int 1.55 exh
flow 352 intake 700 lift 245 exh ,700 lift
cam is 114 lobe sep 110 inteke centerline
@0.50 282 in 294 exh dur ( yes the cam is about 10 degees wrong )
765 lift int 735 lift exh
( yes have degree the cam )
i did dyno tested the engine and it was making 768 horsepower on 7500 rpm
messured one carb on dyno it was flowing 495 at wot
so the engine was taking about 990 cfm
i was thinking if i am ported the heads with more flow to about 375-380 cfm on intake 265 cfm exh
changing cam with the new ported heads
can dual 1050 dominator carburators suport this
thinking.. with 0.5 vacuum the 2 dominators will flow about 1212 cfm with the sheetmetal intake
it dosnt mather if it will rev about 8000-8500 rpm
Thanks
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Re: more carburator on 18 degree 406 cui sbc
As per the thread title...
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
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Re: more carburator on 18 degree 406 cui sbc
Bud, i think you already have plenty of carburetor function, JMO, Mark H.
Re: more carburator on 18 degree 406 cui sbc
The 4.125" bore is a bit tight for the 2.180" intake valve. Lsa too wide imo but not bad on hp.
Re: more carburator on 18 degree 406 cui sbc
Modified 850 Holleys, flowing 1130 CFM, each would give you Dominator level air flow, but with higher mixture velocity than Dominators. Even with improved heads and possible improvement on your intake and cam, this would feed whatever HP your 406 will make. I built a set of these for a Ford 520, and that engine is making 1000HP .
Competition Fuel Systems Birch Run,MI. www.compfuelsystems.com/index.html 520-241-2787
Re: more carburator on 18 degree 406 cui sbc
Your carb size is definitely NOT holding you back at that HP level.
Rick
Rick
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Re: more carburator on 18 degree 406 cui sbc
thanks
what is your suggestion to make this to go over 800 horsepower
what is your suggestion to make this to go over 800 horsepower
Re: more carburator on 18 degree 406 cui sbc
Those 750's you have can be modified to flow well over 900 cfm each. That would be enough to handle the power you're looking for.
Competition Fuel Systems Birch Run,MI. www.compfuelsystems.com/index.html 520-241-2787
Re: more carburator on 18 degree 406 cui sbc
Be willing to play with the plenum volume and carb height to optimize for the bigger carbs to be best.
Do not relate carb size rating to what is the most powerfull carbs , especially on a tunnel ram..
Buddy did a very similar brodix 18x 406 sbc years ago when they first came out.
Your cam is not too big.
The only way to know for sure is to try the carbs and dyno it.
Do not relate carb size rating to what is the most powerfull carbs , especially on a tunnel ram..
Buddy did a very similar brodix 18x 406 sbc years ago when they first came out.
Your cam is not too big.
The only way to know for sure is to try the carbs and dyno it.
Re: more carburator on 18 degree 406 cui sbc
your is too big; 276@ .050 is plenty. Too big a cam will cost you more HP than one that is too small.
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Re: more carburator on 18 degree 406 cui sbc
I do NOT agree that his cam is too big-- I run much bigger cams than that, and I make much more horsepower at a higher peaking RPM
JOE SHERMAN RACING
JOE SHERMAN RACING
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Re: more carburator on 18 degree 406 cui sbc
what do you suggest joe to make moore power on this engine
thanks
thanks
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