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  #31 (permalink)  
Old 02-07-2005, 10:25 PM
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http://teamrfc.gospelcom.net
 
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1964 your combo sounds good. I cant see anything wrong with it. My best guess would be around 330 hp assuming you are at around 9.5:1 compression.

Adam

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  #32 (permalink)  
Old 02-08-2005, 07:41 AM
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I would run 11:1 cr with a cam that big. I have no problems with my 350 with 11:1 and a big cam with pump gas. And I have iron heads and I run N20. Big cams bleed off cylinder pressure! Don't confuse compression ratio with cylinder pressure.

Plus long rods, short strokes, and big cams can handle a bunch of compression ratio on pump gas.

Tight lobe centers makes a lopey idle and a shorter and peaker power band and quicker throttle response. The opposite is true for wider lobe centers. Overlap doesn't bleed off cylinder pressure!!!! It is the late closing point of the intake valve that causes that. As the piston is rising in the cylinder bore (on the compression stroke), if the intake valve is still open it reduces cylinder pressure (makes sense). Furthermore, wider lobe centers will cause the intake valve to close later which will cause reduced pressure. But, it ALL depends on the intake closing point.

327's make about the same hp as a 350 but need more rpm to do it. Plus 327's make less torque makes of a shorter stoke (less mechanical advantage).

Your cylinder heads will be the limiting factor. I'm guessing 425 hp at 7000 rpm and 400 ft lb of torque at 4800 rpm with a 10.5 cr 327.
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  #33 (permalink)  
Old 02-08-2005, 04:33 PM
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i think it is 11:1 thanks for the information
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  #34 (permalink)  
Old 02-09-2005, 07:01 AM
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Even a 9:1 engine could detonate on pump gas if the cam was small enough!

Look into calculating the "dynamic compression ratio" of your engine combo. This formula uses stroke, rod length, static compression, and intake closure point to find the "real" compression ratio. Do a web search on dynamic compression ratio and you will find a bunch of stuff.

Changing to a cam with a wider lobe center (like 110) would reduce the dynamic compression and lessen the octane requirement. The wider lobe center moves out the intake closure point.

good luck!
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  #35 (permalink)  
Old 03-25-2005, 10:51 PM
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Quote:
Originally Posted by 454C10
Changing to a cam with a wider lobe center (like 110) would reduce the dynamic compression and lessen the octane requirement.
It seems to me that a wider lobe center-line angle (LCA) would reduce overlap between the intake and exhaust valve opening, effectively increasing the dynamic compression and increasing the octane requirement. A narrower LCA cam would increase overlap, decrease the dynamic compression ratio, and give you "a better shot" at running pump gas with the iron heads and the 11:1 compression ratio.

The narrow LCA cam will also decrease manifold vacuum (vs. a wider LCA cam), idle rougher, and make optimum torque and HP at higher RPM. Going with the narrow LCA cam almost necessitates you running a little higher static compression to have adequate "dynamic compression" with a camshaft that has alot of overlap. An overlap of 50 to 75 degrees is about the maximum for a "hot" street rod setup and... as a general rule... the smaller engine displacement requires wider LCAs. I did not see an LCA for the cam listed in your post, but a LCA of around 110 degrees would be worth considering in your build up with a 280 duration camshaft.

Last edited by wshinn; 03-25-2005 at 10:56 PM.
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  #36 (permalink)  
Old 03-26-2005, 06:56 AM
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Quote:
Originally Posted by J327HO
"sorry about putting this in someone elses thread,I am ...


..
hello boys...me and my brother are having a 67' 327 built ...here's whats going into it...

small journal steel crank checked,polished - .10 undersized
stock rods from 67' 327
clevette77 ' H ' series rod & main bearings
ALL ARP bolts & studs *every bolt inside and out*
speed pro power forged aluminum pistons (10.35 comp. ratio )
childs&albert dura-moly rings
TCI rattler dampener *balancer*
Crane Cams blue racer double roller timing set
Herbert solid lifter cam - .518/.536 lift - dur.- 280-288 ...
herbert solid lifters
Herbert swedged end (.080" wall ) 1 piece pushrods
World Sportsman 2 64cc Heads - straight plug - 2.02/1.60 valves
Comp Cams magnum roller rockers - 1.5 ratio
Fel-pro gaskets used except head gaskets
SCE pro copper head gaskets .032" thick
melling high volume oil pump - & Melling pump shaft
Herbert extra capacity (7 qt.) oil pan & pickup
MSD pro billet distributer with vacuum advance - & 6T box,etc
MSD 8.5 wires
Edelbrock Victor Jr. (1" taller) aluminum single plane intake
Edelbrock performer 750 carburetor
Edelbrock performer 110 gph fuel pump & Herbert pump pushrod

... anyways ...if im missing something just tell me,lol... what would the horsepower potential be for this setup we're doing here??? the block work was donr by Jungle, it is .60 over ...everything was checked,crank is great! ...anyways,like to know the power potential we'll have with this... Thanks!!!

oh,we might go with a Holley street avenger 770 carb,just depends....and the engine is going to be balanced by a race shop close to here....everyone swears by them and there work.. so..

cam specs -

RPM range - 2500-7000
int.-Dur.-exh. - 280...288
int.-.050-exh. - 244..252
int.-lift-exh. - .518/.536

Lash-lobe C - .024- 106c



You are building a racing engine. I assume you are going to use racing fuel. Personally, if you are just building a toy, you might as well bump the compression up to about 12.5:1.

Forget running pump fuel in it anyway. Bite the bullet and buy some race gas. You need the big compression ratio to increase torque. Everything else looks fine for a drag motor. Use very deep gears and a high RPM launch.
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  #37 (permalink)  
Old 08-17-2011, 06:22 PM
SPEED MASTERS CC's Avatar
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YOU ARE RIGHT ON! THE 106 LCA WILL BE GREAT!
Quote:
Originally Posted by 454C10
I would run 11:1 cr with a cam that big. I have no problems with my 350 with 11:1 and a big cam with pump gas. And I have iron heads and I run N20. Big cams bleed off cylinder pressure! Don't confuse compression ratio with cylinder pressure.

Plus long rods, short strokes, and big cams can handle a bunch of compression ratio on pump gas.

Tight lobe centers makes a lopey idle and a shorter and peaker power band and quicker throttle response. The opposite is true for wider lobe centers. Overlap doesn't bleed off cylinder pressure!!!! It is the late closing point of the intake valve that causes that. As the piston is rising in the cylinder bore (on the compression stroke), if the intake valve is still open it reduces cylinder pressure (makes sense). Furthermore, wider lobe centers will cause the intake valve to close later which will cause reduced pressure. But, it ALL depends on the intake closing point.

327's make about the same hp as a 350 but need more rpm to do it. Plus 327's make less torque makes of a shorter stoke (less mechanical advantage).

Your cylinder heads will be the limiting factor. I'm guessing 425 hp at 7000 rpm and 400 ft lb of torque at 4800 rpm with a 10.5 cr 327.
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  #38 (permalink)  
Old 08-17-2011, 07:23 PM
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6 year old post, Speed.
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