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Help choosing and cam and Hughes Cam Question..
In a thread I previously posted I am having a compression problem with my 70 Bee. One of the problems might be a wiped cam. If that is the problem I will have to replace it.
The cam I am using right now is the Mopar Performance resto cam for the 440 six pack engine (It the same as the 383-440 magnum cam expect for 1 bolt on the cam sproket) The engine is a very stock 383 (manifolds stock exhaust) with a auto trans stock converter (about 2300-2400 stall) and has run 14:70's with 3:23's and 14:41's with 3:91's on F70-14 Polyglas's) What I am looking for is a cam that will give similar vacuum readings at idle (14-16 Hg) and a more torque and Hp (If possible) I have been checking into Hughes Cams.. Any opinion on these? If so which one to use? Any other companies I should try? Thanks for any help Florida_70Bee |
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Being that hughes dosn't have a replacement cam, I would give them a call and speak with them directly. That, I think would be the best way to go about it.
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For hydraulic cams, hard to beat those offered from hughes. Call them up, they will get you the cam you want. I'll say a HE2330BLw/ 3.91's (1600-5700 pwerband) or HE1923BL w/ 3.23's (1400-5000 powerband). They WILL ask about cylinder pressure. They will also want you to buy ALL related valve gear (springs, lifters, etc)
Other then Hughes, look at Comp at their X-Treme Energy cams. Mills |
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Re: Help choosing and cam and Hughes Cam Question..
Quote:
But when you want a cam-LUNATI |
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Cams can cause a compression loss due to the fact the valve barely opens to let air in. When I rounded a lobe I did a comp check and found 160 in all and the one with the rounded lobe had 30. Can't make compression without the valve opening all the way. I have less cylinder pressure with the stock magnum cam than what it had with the .509.
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Quote:
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I found the compression problem I am having.
The exhaust valve on cylinder #3 is not seated correctly. (I just posted what I found out in my other thread.) I am now going to get someone to fix the problem. I appreciate the suggestions! Please keep em coming. Allthough the present cam looks like it is good shape (none of the lifters were dished). I still will probably consider a cam swap now that I have the motor this far apart. I checked the piston to deck clearence to give me some idea what the estimated compression ratio is. The engine is a std bore 383 magnum. The piston is .020 below the deck at TDC (from what I checked). the head gasket looks like the Mopar Performance steel shim with what I think is .020 compressed thickness. (I know it probabily this because I bought the Mopar Performance engine kit for the guy who rebuilt the engine 5 years ago) The cold cranking compression on the cylinders is 150--155 lbs. Now I need to check the size of the heads (the original 906's) According the old D-C technical book the engine with these variables and a 86 cc head would have a compression ratio of 9.25, with 80 cc heads 9.80, and with 74cc heads 10.43. I bet I have the 86cc heads. Hope that helps in any cam suggestions. By the way here are some pictures of my car. My friend allows me to use part of his website and I thought some of you might be interested. http://www.71superbee.com/1970/images/ Thanks for all of your cam suggestions and keep them coming. Florida_70Bee |
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Quote:
I posted in his other thread, never said its the cam, but could be. |
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As a bit of a side note to the responce of MILLS; In the feb 2002 Mopar Action mag , there is an artical on lifters from SCHUBECK in las Vegas. These lifters are suppost to be reuseable,with special coating and damn near indestructable. Might be the way to go with a hughes cam. have tried the web site for this manufacturer ,but have been unable to get through.
Maybe some of the other members on this board have tried these SCHUBECK lifters .......? just a thought. |
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I know of one schubeck ceramic lifter that came apart in a 10 second /6 racing engine. I wouldn't use them for anything.
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Just got the Hughes cam installed in the 440 +.030" RB Ramcharger. Engine is set up as: Flat top Forged TRW's, double roller TC, Aluminum dual plane Edelbrock intake (not RPM) 850 TQ Hooker Headers, dual 2.25" exhaust with H pipe. Hughes towmaster torque converter 727 Torqueflite
Old cam was MP .455" 272 duration. Old vac readings idle in N 10" 10 degrees adv on timing Old vac readings idle in D 8" Vac readings with Hughes cam: 10 degrees adv on timing Idle in N 16" Idle in D 14" Hughes cam is the HE1423bl great for the .323 gears and 31" tall tires, not to mention the 5100 pounds. Excellent driveability, especially from cold start up. Be smart, use their springs, big difference!! |
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