500 cu hemi w/f2 procharger

[hemicar]

ok i am getting ready to jump on the list for my aluminum block. Looking for opinions on bore x stroke to obtain 500 inches

1.would it be better to go big bore small stroke
OR
2.better to go small bore big stroke

Looking to make around 1600-1700 hp, have talked to alot of roots style blower guys and they all seem to go with 4.50 stroke and 4.19 bore(498cu). trying to stay in the 7000-8000 rpm range for longevity and really just looking for different opinions.
Thanks JC

[TurboAWD]

Stroke. Blower motors need swept volume, period. Favour that and you'll be fine.. Iam not up on blown hemis (need help with a sb chrys ask away though!) but you shouldnt have trouble finding someone that knows....

[Moparchris440]

ok i am getting ready to jump on the list for my aluminum block. Looking for opinions on bore x stroke to obtain 500 inches

1.would it be better to go big bore small stroke
OR
2.better to go small bore big stroke

Looking to make around 1600-1700 hp, have talked to alot of roots style blower guys and they all seem to go with 4.50 stroke and 4.19 bore(498cu). trying to stay in the 7000-8000 rpm range for longevity and really just looking for different opinions.
Thanks JC
why only 500 ci

[68Bird]

Stroke. Blower motors need swept volume, period. Favour that and you'll be fine.. Iam not up on blown hemis (need help with a sb chrys ask away though!) but you shouldnt have trouble finding someone that knows....

Would you care to explain why that is? I was always under the impression you wanted the bigger bore to help unshroud the valves and a short stroke to decrease cylinder fill time. Also, the shorter stroke could be wound tighter up top and have less torque down low to help a traction limited car.

But I am NOT speaking from experience, just what I've seen others running. I'd really like to hear from someone that has first hand experience.

Thanks.
Craig

[hemicar]

why only 500 ci

I would like to street drive this car on very limited occassions. plus 498cu is the same cu as a top fueler so they gotta know something. just wondering if the setup would be the same from a roots style to a procharger. i mean in reality they are both force fed so i am leanin toward them being the same

[niceguy]

I would like to street drive this car on very limited occassions. plus 498cu is the same cu as a top fueler so they gotta know something. just wondering if the setup would be the same from a roots style to a procharger. i mean in reality they are both force fed so i am leanin toward them being the same

I am gonna throw my two cents in..... the only reason Top Fulers run 500ci is because that is the maximum allowed by NHRA.

If you are gonna drive it on the street, it is gonna need low compression and low boost. Make that beyotch 630ci or bigger.... I don't know what MOPARS can go to ci-wise. But make it as big as possible, then you have the best of both worlds... huge bore for unshrouding, big stroke for volume filling. LOL

[Moparchris440]

I am gonna throw my two cents in..... the only reason Top Fulers run 500ci is because that is the maximum allowed by NHRA.

If you are gonna drive it on the street, it is gonna need low compression and low boost. Make that beyotch 630ci or bigger.... I don't know what MOPARS can go to ci-wise. But make it as big as possible, then you have the best of both worlds... huge bore for unshrouding, big stroke for volume filling. LOL EXACTLY big motor Low boost

[Mike Coffey]

[quote=niceguy]If you are gonna drive it on the street, it is gonna need low compression and low boost. /quote]

I am going to have to disagree. I run 11to1 compression on my blower motor and upwards of 22 pounds of boost at 7300 RPM non intercooled and I street drive mine all the time. I have just started to put the tune on this thing.

[Mike Coffey]

ok i am getting ready to jump on the list for my aluminum block. Looking for opinions on bore x stroke to obtain 500 inches

1.would it be better to go big bore small stroke
OR
2.better to go small bore big stroke

Looking to make around 1600-1700 hp, have talked to alot of roots style blower guys and they all seem to go with 4.50 stroke and 4.19 bore(498cu). trying to stay in the 7000-8000 rpm range for longevity and really just looking for different opinions.
Thanks JC You might want to think about an F3. An F2 will support up to 1600 HP and make around 36 pounds of boost. An F3 will support well over 2000 HP.

[niceguy]

Sorry I guess I should have said on pump gas. That is what I think of when someone says they want to drive it on the street.

[Moparchris440]

[quote=niceguy]If you are gonna drive it on the street, it is gonna need low compression and low boost. /quote]

I am going to have to disagree. I run 11to1 compression on my blower motor and upwards of 22 pounds of boost at 7300 RPM non intercooled and I street drive mine all the time. I have just started to put the tune on this thing.
let me guess 93 octane too? Ya I drive my 600 ci blown aolchol hemi on the street too 3 gallon fuel cell and all, hes talking a street car on pump gas again I say go big ci and low boost

[Mike Coffey]

I would like to street drive this car on very limited occassions. plus 498cu is the same cu as a top fueler so they gotta know something. just wondering if the setup would be the same from a roots style to a procharger. i mean in reality they are both force fed so i am leanin toward them being the same Not even close! There are many things that make them different. Blow off valve for one. They make the centrifugal style blower alot more streetable than a roots style blower because the blow off valve stay open when you are just cruising around and bleeds off any boost. Zero boost = cooler running motor. When you jump on it, the blow off valve closes and you have instant boost. It works off intake vacuum. Also a centrifugal style blower takes less horsepower to turn and weigh alot less than a roots style blower. There are guys making over 1800 HP with one blow through carb. My little mild 23 degree headed, street roller cam Smallblock will make over a 1000 hp at 25 pounds of boost and still be streetable. Wipple or twin screw blowers are probably best for all out horsepower. Don't get me wrong. Roots blowers look cool,sound cool and you can make good horsepower with them.

[Mike Coffey]

[quote=Mike Coffey]
let me guess 93 octane too? Ya I drive my 600 ci blown aolchol hemi on the street too 3 gallon fuel cell and all, hes talking a street car on pump gas again I say go big ci and low boost I have a 12 gallon fuel cell for 80 mile round trips and I run Torco 110 out of a gas pump for the street and VP 116 at the track. I also run a programmable digital boost timming control.

[Mike Coffey]

i say go big ci and low boost I say go big ci. and alot of boost with an F2.
Chris, if you think I am full of shit, ask Powski. He helped me set up my blower and fuel system. Jim went 8.60's with a 360 ci. sbc with Vortek heads, F2 blower, one blow through carb, non intercooled on a small BFG drag radial tire ten years ago.

[Mike Coffey]

Chris,
I am building and destroked 377ci. smallblock with Dart 18 degree cnc ported Pro1 heads and a Steve Morris custom ground camshaft. It should make 1200 to 1300 hp on Steves dyno.
If your truck drops 400 pounds like you said and my car 150 pounds, maybe i'll put some slicks on and we can get it on.

[hemicar]

I say go big ci. and alot of boost with an F2.
Chris, if you think I am full of shit, ask Powski. He helped me set up my blower and fuel system. Jim went 8.60's with a 360 ci. sbc with Vortek heads, F2 blower, one blow through carb, non intercooled on a small BFG drag radial tire ten years ago.

I was thinking the same thing. 572ish cu 10-11:1 with 30+ lbs. of boost

[Mike Coffey]

I was thinking the same thing. 572ish cu 10-11:1 with 30+ lbs. of boost Sounds like a bad ass motor to me. You could run pump gas on the street then put race gas in it and make 1600+ hp for the track.

[Moparchris440]

I was thinking the same thing. 572ish cu 10-11:1 with 30+ lbs. of boost
your first post you were intent on only 500 ci now 572ci, top fuelers are only 500ci they must know whats up has nothing to do with nitro methane netting them a little extra power. Seriously 572 with a square bore and stroke of 4.50x4.50 is a exellent choice but 30plus lbs of boost on the street with pump gas "take it easy" thats like 16-17 to 1 at that boost level it will require c16- sure it may run on something less but is it worth the chance?

[hemicar]

your first post you were intent on only 500 ci now 572ci, top fuelers are only 500ci they must know whats up has nothing to do with nitro methane netting them a little extra power. Seriously 572 with a square bore and stroke of 4.50x4.50 is a exellent choice but 30plus lbs of boost on the street with pump gas "take it easy" thats like 16-17 to 1 at that boost level it will require c16- sure it may run on something less but is it worth the chance?

not really intent on 500 exact. guess i should have worded better. i want to stay in the 500 range, no 600 inch motors. boost will be much lower on the street(it may get street driven at most 200 miles/year) but will always use race gas. i also am using an air/water intercooler. just trying to find a combo that will have longevity and make the power i want. i looked into the f-3 and nobody wanted to sell me a belt driven one, only a crank driven and i don't have the room for it. so for now i'm just gunna play around with the f-2.
Thanks for all the input
JC