Blower Info Needed

[Charger4404spd]

OK, so I have always wanted a blower, mainly for the sound and cool factor. I have the top of engine off right now because my intentions were to install a set of Eddy heads. I now have the blower bug and need to know if you guys think this combo will be reliable.

Motor is a .040" over 440 , 69 block, steel crank and factory rods. Pistons are SpeedPro forged flatops (L2266). So I know compression should be under 9 to 1, I will use my 906 heads instead of going with the Eddy heads. I have not cc'd them yet. I have .080" piston to deck clearance. Now if I use a thick head gasket, I should be able to get well in under 9 to 1. I hope. I will cc my heads this week. I have punched in a few numbers in the compression calculator.

bore                 4.36
stroke               3.75
cc                    90 (just a guess, it will probably be more)

deck clearance  .080"
gasket             .050"

Using these numbers I get 8.53:1 compression.

I could use a thicker gasket I guess to even lower this if necessary?

I am assuming I could run around 6lbs of boost. I know next to nothing about forced induction, so I value comments from you guys.
So is this doable and still be a reliable engine. The Charger will not see track time, just cruising.

Also, I am currently looking at a blower from SuperChargerUSA. Anyone have any comments about this company? They have a 3 year warranty and their prices are a little lower than BDS. From what I have read, a guy left BDS years ago and started this company.

Steve

[Charger4404spd]

Here is the piston info:

Compression ratio is

figured with 78.5cc heads.



Forged Piston Flat Top, 4.360 Bore, 3.375 Stroke, 6.768 Rod, 440 Chrysler (L2266F-40) Specifications
Bore Diameter (in.):      4.35
Compression Ratio:      9.30:1
Dish / Dome Volume (cc):      -7
Pin Height (in.):      1.991
Ring Package:      5/64 5/64 3/16
Rod Length (in.):      6.768
Stroke (in.):      3.375
Weight (grams):      876
Wrist Pin Type:      Pressed

[cdr]

I would have the combustion chambers opened up on the eddys to get the compression you want  8 to 8.5, if you use your 906 heads it will cost alot to get valve & good seats, guides for unleaded fuel just my

[cdr]

 your cam will need to have at least112 to 114 lobe sep, to work with a blower

[Charger4404spd]

I have been running the 906 heads for a while, I will take them to be checked out and get a good 3 angle valve job.

[cdr]

O K

[Charger4404spd]

I just cc'd the heads and best I can tell is they are around 95cc (maybe a bit more), which should bring my compression down to 7.99:1 with a .039" head gasket.

[cdr]

takr a pic of combustion chamber & post,sounds like the valves are sunk

[cdr]

alott

[Charger4404spd]

[Rolling_Thunder]

I know John (SRT68) had a blown 440 in his 55 pickup for years and never had a problem. I believe he was running an 8-71 with iron heads. Might want to PM him and ask about his set up - 


I am currently lookin into blowers myself...     I already told myself if I get this new job - it's on.   

[firefighter3931]

My buddy ran that exact same combo for several years ; 906 heads/stock crank & rods with 2266 pistons and a solid flat tappet cam with a 671 supercharger and it ran great. Keep the boost under 10psi and it will be fine  A 112 lsa cam with an extra 6-8* exhaust duration would be ideal for a mild street blower setup. 


Ron

[Rolling_Thunder]

Yeah - If I remeber John's combo at all he was pushing 8psi and ran some old lazy SSI cam from PAW

[Charger4404spd]

Thanks guys! I am looking at Don Hampton blowers also. Has anyone ever dealt with him?

Another question. Will the Mopar electronic ign. be ok to run? Maybe upgrade to the chrome box?

[Rolling_Thunder]

I would run an MSD unit for peace of mind. Not only for the multi-spark aspect but the added benefit of a rev-limiter. Blower motors love to rev fast and anything over 6000rpm you'll be s***ing your pants anyway. Again, just my opinion and what I've seen.

I have no experience with Hampton

[Charger4404spd]

 

[firefighter3931]

I would run an MSD unit for peace of mind. Not only for the multi-spark aspect but the added benefit of a rev-limiter. Blower motors love to rev fast and anything over 6000rpm you'll be s***ing your pants anyway.

There's no need to rev a blower motor...power is instantaneous off idle ! 

Agree with Alex on the MSD. Blowers make lots of cylinder pressure so you need a really strong spark to light up the mixture. MSD, strong coil and good wires 



Ron

[Charger4404spd]

Will the MSD box work with the Mopar distributor or will I need to upgrade it to MSD also.

[Rolling_Thunder]

I have run an MSD box on a MP dizzy - just connect the two wires correctly and she'll fire.

[Charger4404spd]

 

[John_Kunkel]

Here's my old street-driven '62 Dart circa 1976; 426 Wedge, 6-71 blower driven 15% over, two 780 Holleys, 7.8 compression, Crane R-280 cam and Mopar Electronic Ignition. Run on Chevron White Pump 104 octane gas. Very docile, very driveable.

[Charger4404spd]

Sweet ride John.

Little update. I spoke with Don Hampton yesterday. Told him what I had and what I wanted and he said it would be a good combo. He said the 6-71 would be as good as the 8-71(only 1 inch difference between the two) and I would save $500 and I could run 7lbs of boost and not worry about anything. He had me to call Engle Cams and I spoke to Chris there. He recommends the K56 grind with a 112° centerline.

Also going to order a set of MRE valves (2.14/1.81) and 10° locks for the 906 heads. So things are coming together nicely.... now I just need to save a little more milk money

[Rolling_Thunder]

mmmm   Engle Cams...    K56 is a nice docile cam for the street.

[Charger4404spd]

mmmm   Engle Cams...    K56 is a nice docile cam for the street.

If I remember right, Chris (6T9) has that cam.

[Rolling_Thunder]

Yep - he's running a K56 but not sure on the 112LSA ---     

If you talk to the guys at Engle again ask them if a split duration cam would benefit you. I am not an expert but more exhaust duration is always nice on a blower motor as long as overlap is not increased by much.