Tahoe540

Great post thanks, I just dropped off my 548 at the shop to get dyno'd next week. 088 heads with 10:1 compression and using 454-R intake and 850 cfm carb. Looking forward to how it compares.

liquidlounge

iTrader: (1)

The carb-efi comparison on similar or same manifolds will be very interesting. Thanks as always for sharing!

ezstriper

again great job smitty...sorry for the phone deal the other day...I'll give you a call later Rob

articfriends

iTrader: (1)

One step forward, two steps back. Hp, afrs, tq went right to hell with dominator on one inch spacer, either manifold totally hates short spacer or motor loves the adapter and spacer under modified 4150. Maybe we created a mini tunnel ram with the adpater/spacer and motor loves it. Hp dropped from high 670s muffled to mid 650s AFTER alot of tuning , about 22 to 25 hp down at same afrs. 4150 was square jetted to side, took 8 jet sizes and 6 high speed bleed sizes to get afrs to match side to side within 1/2 point with dominatorl ;With open headers and same afrs at 6200 ish we are down 29 hp from 687 to 658 CF and air conditions identical as previous pulls at 1.035, surprisingly torque was identical at 639 ish but peak moved up to 5100 from 4900/5000. trying to borrow a 2" dominator spacer to test with or i will make one monday tuesday to re-test, i need to get 3" of spacer under dominator to see wtf is going on, will post when i have more, Smitty

Full Force

iTrader: (5)

So 29 hp loss from the modified 4150 carb to dominator?

articfriends

iTrader: (1)

On another note, these Canton power pans can go in Garbage, waste of 650 each, when dyno testing started oil pressure would dive from 75/80 psi to 40 ish and back several times from 6000 to 6700, pulled heads, opened up drain back holes, then oil press dipped LESS from 75/80 to 60/65, punched drain holes in lifter valley screens which I have used in the last 15 motors i built with no problems and with a extra quart in pan oil press twitches 5 psi around 6200/6400. I guess 8" deep pans suck for these rpms, never had this problem with my hardin 14 quart off shore pan, same motor at same rpms! On ANOTHER note, if it turns out this speedmaster intake loses 25+ hp when going down from 3" spacer to 1" spacer I think we may have found 25+ hp that tim full force may be missing with NO spacer on same intake!!!!

Gimme Fuel

On my Edelbrock 454-R the website even days that it requires a 1" spacer to hit advertised levels. I believe if you buy a new one it actually comes with one. A pro-filer intake actually comes with a 1" spacer built in.

Question is will the spacer difference come from added plenum volume or extra effective runner length and flow straightening, or both.

I'm excited to see my 90 degree throttle body elbow and the 102 mm monoblade when he tests port injection on the chinesium intake

articfriends

iTrader: (1)

Yes, carb built by same guy, my partner on dyno, norm schenck. Carb also flowed within 10 cfm on flow bench to the 4150, about 1170/1180 cfm. Assuming there isnt a problem with this carb, its all in the intake spacers, once afrs are correct or same, fuel is atomized and as much air is supplied to motor as it needs it doesn't care what carb is on it, it does HOWEVER respond to plenum volume, air turning corners etc I dont have 4500 flange spacers laying around so I am trying to borrow one or will make one this week, If I piss around 2 or 3 hours making one Monday how ever it will move dynoing back a day as I do have a full time job and have jobs/customers to deal with at my business (my second job). I do have a customers monster truck deal sitting out back with a 528 ci ford with dominator on it, I will take a look and see IF it has a spacer under carb and how butchered up carb is as Id like to try more spacer and even a different dominator.

articfriends

iTrader: (1)

[QUOTE=Gimme Fuel;4528243]On my Edelbrock 454-R the website even days that it requires a 1" spacer to hit advertised levels. I believe if you buy a new one it actually comes with one. A pro-filer intake actually comes with a 1" spacer built in.

Question is will the spacer difference come from added plenum volume or extra effective runner length and flow straightening, or both.
The question that comes to mind if the hp goes to **** on a open plenum intake without a bunch of spacer carbed is it air flow path/plenum volume OR fuel distribution, will it have same problem with dry flow, would look pretty goofy on your boat if you had to have a 3" spacer under your 90 or would 90 add plenum volume??
You dont have another dom spacer do you ron? I have yours that was on the 454r , I can stack it on norms phenolic then stacjk a 3rd one, only problem is they should all be blended together or we are creating a new problem !

articfriends

iTrader: (1)

I might call the turd burglar rosebush in bay city and pay him the top dollar monday if he has something!