Yellow Bullet Forums banner

1 - 20 of 32 Posts

·
Registered
Joined
·
26,489 Posts
Discussion Starter · #1 ·
Going back on the pump one last time. I'm thinking about borrowing a dominator and adaptor and seeing if it picks up. What do you guys think???

417ci
4.185 bore
3.79 stroke
5.990 MGP rods
13.8 static....Pistons, pins and rings are for a NOS hit.
Moroso air pump w/ 12in vac
.721ex .767 in. after lash. 276in. 294ex. @50 113 in @ 109
406cfm @ .800 W-8 15 degree 2.18in 1.60ex
cast Mopar 4150 intake ported by MBE w/ 2in wilson spacer
Willys 4150 950 1.590 w/ 1.750 blades
2-2.125-2.250 pipes w/ 4in Burns merge
Air fuel ratio, BSFC and fuel curve all good.
841hp @ 8000 634tq @ 6200

I'm not looking for a dyno number. I'm wondering what would accelerate the car faster. Is it worth the dyno pulls to tune in the 4500 or should I just try the two carbs at the track when the car is finished???
 

·
Registered
Joined
·
6,634 Posts
Try a 1150 or 1250, my SB2 made about 25 more on the dyno with a 1250 over an 1150.
 

·
Super Moderator
Joined
·
34,737 Posts
Keep the carb small.... 1050 max dominator. 850 hp, is questionable on if it really needs one or not. A large 4150 will support the power, and accelerate harder.
 

·
Registered
Joined
·
2,270 Posts
Keep the carb small.... 1050 max dominator. 850 hp, is questionable on if it really needs one or not. A large 4150 will support the power, and accelerate harder.

Amen.

I build a group of Ford engines of similar displacement & power output (dead even with you on TQ & within 10 on HP) and the engines are run in the vehicle with a carb that flows 988 CFM with a venturi diameter so small you'd say I was a liar if I told you. Main body begins life as a 650 HP and is worked from there.

This combination makes a tick more power than a 950 HP from a "Pro" builder and it consumes about 2 gallons less fuel per 15 lap race than the "Pro" combination. Driver recognized the change right away & feels that now the engine runs as crisp at the end of the event as it did in the beginning.

You can trick yourself on the dyno with the bigger carb. I ran a 351 W Ford that a guy built at home & found an 850 to be about 15 HP better than the customer's 750, even though this POS was a hydraulic cammed deal that only made ~360 HP. In the car the 750 worked better all the way around.
 

·
out of work hair dresser
Joined
·
8,341 Posts
Keep the carb small.... 1050 max dominator. 850 hp, is questionable on if it really needs one or not. A large 4150 will support the power, and accelerate harder.
Another "amen" brotha.

950 HP will do exactly what you want.
 

·
Registered
Joined
·
3,066 Posts
call patrick at Pro-Systems. He will set you strait on what you need.
 

·
Super Moderator
Joined
·
34,737 Posts
If you were spinning 97-9800 with that 417, and your operating range was never below 8000, the dominator would be a good thing to try. But for 8000 rpm peak..... I'd stick with the 4150.
 

·
Registered
Joined
·
26,489 Posts
Discussion Starter · #14 ·
Never hurts to try things tho Jim. Not everything is gospel.
We were thinking the same thing about the relativly low rpm.

It made peak power at 8000, but it didn't fall off more than 5 horse to 8300.

We're going to pull it to 85 or 8600 to see just where it takes a shit.

I'm guessing its going to cross at least 8500 or so.

Plus, I think the 4150 will be a little happier lugging around on the street once in a while.
 

·
Registered
Joined
·
6,634 Posts
We always ran about about a tenth quicker with a Dominator over an 800, even on a pump gas 406 with near stock vortec heads. A footbrake car may like a smaller carb, but your engine doesn't fall in that category. The key is getting a good working Dominator.
 

·
Registered
Joined
·
839 Posts
I have friends that swear they pick up using a 4500 over a 4150.
But I have a pretty stout sb and the 4150 runs great. Patrick makes one bad ass 4150.

Infact Patrick told me I would probably not pick up anything switching to a 4500, because his 4150 is very efficient. But being hard headed I had to try. Considering the money wasted, I should have just listened to him.

Pro System XE 4500-1000
CSR throttle bracket-65
Wilson 4150/4500 adpater-100
Gaskets-15
 

·
Registered
Joined
·
26,489 Posts
Discussion Starter · #19 ·
I have friends that swear they pick up using a 4500 over a 4150.
But I have a pretty stout sb and the 4150 runs great. Patrick makes one bad ass 4150.

Infact Patrick told me I would probably not pick up anything switching to a 4500, because his 4150 is very efficient. But being hard headed I had to try. Considering the money wasted, I should have just listened to him.

Pro System XE 4500-1000
CSR throttle bracket-65
Wilson 4150/4500 adpater-100
Gaskets-15
If I cant borrow some stuff to try a dom at the track I'm not going to bother.

I'm probably going to eventually sell the small motor and do a big block for the car, so I gotta save my nickles and dimes.lol
 

·
Registered
Joined
·
6,634 Posts
I would challenge that statement, and suggest that the key, is a good working 4150 for a combo like above.
My dyno numbers don't lie. Torque was up on the 1250 from 5800 up, peak torque at 6500. 25 HP more at 7500 peak, 1250 lost 20 @ 8000, 1050 lost over 35. If you can get the bigger carb to meter fuel CORRECTLY in the RPM range you run it in it will run faster.
 
1 - 20 of 32 Posts
Top