Anybody have any idea of comparison between the Mopar performance 528 lift cam, and the Erson f282/340 cam from the old group buy. If you were building a 170 engine with approx 10-1 CR, engine builder valves, and about 150 nitrous shot, which cam would you use? I have both available. Car weight about 2750lbs, 9 1/2 inch edge converter (should be about 3,000 stall, brakes locked, and motor only) 4.56 rear, 7x26x15 slick

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170

Charlie I always liked that cam but seen two of them wipe off lobes!! If you look in the Engine FAQ section on user cams I had Erson regrind a cam similar to the MP cam for Ryan's Dart. He ran it for 10+ years and 50K miles. It ran really nice. It had 110 LSA so I don't know if that would be good or bad for what your doing. But it worked well in his Dart.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

The cam I just removed, was the mopar 528 and it wiped number 2 exhaust lobe. I have another one, but also have the Erson.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170

I loved my 280/270 Erson. With 10:1 it would be perfect.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

The cam he's referring to is the Erson AM cam which is the next heavier cam in the catalog than the RV30 280 lobe, and has a .510 lift over the .47 lift the 280/270 had... the lobe separation will be wider so it will be a better match to the 170 over the 225, the MP .528 cam is a bit heavy handed if I remember right... the AM cam would like to see the mid-10:1 min as the exhaust lobe has more duration for use with headers for scavenging... I was going to run one at 11:1 in a 225 at one time...but moved on to a bigger OCG stick which worked out fine.

If LSA is wider on the Erson, I would probably use that. 170 will want 4-6 deg more LSA at least compared to the 225. 10:1 is probably fine. Some of those later MP 528s had bad oil pump gears and people had trouble, IIRC.

Lou

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Home of Slant6-powered fun machines

MP cam has a 102 degree center line. Erson cam has a 106 degree centerline.

MP cam adv dur is 284 degrees. Erson is 282 degrees

MP cam dur at .050 is 241 degrees. Erson is 246 degrees

MP gross valve lift is .528. Erson is .510. Erson has slightly less valve lash, so net is slightly closer.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170

Centerline is not the same as LSA. For the 170, I would probably set the centerline around 106, yes. MP 0.528" is 108 LSA, IIRC. What is LSA for the Erson cam? 110?

Lou

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Home of Slant6-powered fun machines

Yes

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

I know, but I don't have the LSA for either cam. I need to do the math.
I think it is 106 LSA for the Erson
Intake open 17 btdc
Intake close 49 abdc
exh open 49 bbdc
exh close 17 atdc
These numbers are at .050 cam lift

Don't have timing figures for the mopar cam

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170

Mopar Purple Shaft P4529343 was 284/284 adv 76 overlap .528 lift .28/32 lash 104 LSA

the Erson AM cam was 284/296 adv with a 108 LSA and .510 lift unless you requested a custom grind...

Erson 270 and 280 lobe cams were 111LSA stock, but some were requested to be ground at tighter LSA like 108... the 111 was perfect for street hyperpak use on the 280/270...

Comp grinds their 252 and 264 at 110 unless you specify something different...

I don't have the dual pattern Erson cam. It is grind number F282/340
.510 lift 282 adv dur intake, and exhaust, 246 dur at .050 intake and exh

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170

Looks like they obsoleted that lobe pattern a long while back, the new catalog no longer carries it... F282/340 is a 282 duration with .340 lift ( x1.5 ratio = .510)...
and is a complete custom job over their old slant six catalog patterns, so you will have to measure or check the cam card for the LSA... If you knew the cam events I can
plug it into a program and spit out the overlap and LSA for you and save the scratchpad time.

Figure out the lobes and specs you like and have Oregon cams make it for you...………….

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

I posted this above.

I think it is 106 LSA for the Erson
Intake open 17 btdc
Intake close 49 abdc
exh open 49 bbdc
exh close 17 atdc
These numbers are at .050 cam lift

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170