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Erson Cam Group Buy
https://slantsix.org/forum/viewtopic.php?t=21400		 Page 14 of 20
Author:  Doc [ Thu Mar 20, 2008 1:27 pm ]
Post subject: 
Thats right, Lou saw this cam's spec sheet when he stopped by last week.
I have not run this design yet but it does look promasing, I do admit that I tend to air to the side of "milder" when it comes to cams... doing that makes everything a little easier to deal with.
DD
Author:  BigBlockBanjo [ Thu Mar 20, 2008 1:31 pm ]
Post subject: 
Quote:
I just designed a "race only" cam with Erson, using some of their "fast rate" 340 Mopar profiles.
The lobes are the F286 on the intake and the F282 on the exhaust.
Lift is .510
The one I had made is on a 106 L/C
This type of cam will need a lot of static compression. You will need forged pistons, good head flow and a mechanically strong assembly for it all to "work".
DD
Oh Man....I'm drooling over that one! What is the duration at .050 with that cam? 240-ish?
Author:  Dart270 [ Thu Mar 20, 2008 2:00 pm ]
Post subject: 
I think it was like 250/244 @0.050" (int/exh).

I feel like running a bigger cam gives more flow, while allowing higher comp without damage. My other feeling is that higher flow will get you a denser charge of air and fuel, and allow the optimal ignition advance to be less advanced (mine around 26 deg total mech), thus giving a more efficient burn. 225s have a small chamber for their cylinder size, so more efficient burn.

Lou
Author:  Doc [ Thu Mar 20, 2008 3:03 pm ]
Post subject: 
The Erson design sheet shows 254 Int. and 242 Ex. @ .050
At 106 L/C this cam has 74 degrees of overlap... that is going to be pretty rough on the idle quality.
I designed this at a wider lobe center (110) but Tom talked me into the 106, below is his comments:
DD
Quote:
Doug I like this profile better. I think a 110 L/C will make it lazy. The 106 will help it leave and the big duration will let the engine run upstairs. I left the F286/.340 intake and changed the exhast lobe to the F282/.340/
Tom
Author:  Dart270 [ Fri Mar 21, 2008 6:58 am ]
Post subject: 
Hmm, that's more difference in duration at 50 than I remember - 12 deg. optimal LSA and centerline may change somewhat based on that. I'll be interested to see how it works out.

74 deg overlap is not too much, in my experience - my current 64 Dart cam has 78. According to Vizard's "ballpark" calculations, this will act something like a 64 deg overlap in a typical SB V8. I'm about to try one in Project V with 98 deg overlap... :P You can probably convince me that one is not for the street, but with over 11:1, we'll see. Cameron's run high 80s to high 90s overlap in his racecar NA motors.

Lou
Author:  ply/six [ Sat Mar 22, 2008 11:15 am ]
Post subject:  Erson Cams
Hi Folks,

Just got in on the Erson cam deal. I spoke with Tom and told him what I wanted to do with my 78 Plymouth Caravelle.
I chose the 270 duration cam with all the hardware.
I had it shipped to an address in NY and then brought it through customs myself. All that was required was to pay the duty.
If anybody is interested the car is a 2dr.sedan,with 3speed o/d and i'm hoping a 3:55 gear.
Just a fun street car.
I'm on the hunt for nice chrome parts ie headlight bezels (same as Diplomat) grille, and the rear side window chrome (plastic).
Anyhow thanks, Barry
Author:  emsvitil [ Fri May 09, 2008 3:25 pm ]
Post subject: 
bump.........
Author:  GoatTuber [ Tue May 13, 2008 4:04 pm ]
Post subject: 
I just called Tom and ordered the E470621. I'm putting new rings, bearings, a milled and ported head, 2bbl from a 318 on the Super 6 intake, and hooker headers on my 225 this summer so I figured I should get a new cam while I'm at it.
Author:  68barracuda [ Tue May 27, 2008 12:07 pm ]
Post subject:  need a online retailer
Hi Guys - I REALY want in on the group buy the E470621 looks ideal

What CR can I run with it?

My problem is that the PBM online store does not list any chrysler bits,
and since i am in South Africa Either I buy through a online retailer or I get some one to buy one for me and ship it over

Other wise it is the 264 compcam unit for me :cry: :cry:
Author:  gmader [ Tue May 27, 2008 1:56 pm ]
Post subject: 
Would it work if you paypal-ed me the money, and I ordered and shipped the cam to you?
Author:  BMXICAN [ Tue Jun 03, 2008 8:21 pm ]
Post subject: 
I would be interested in a cam for my 67 Cuda.
I don't want anything too wild, just want some extra torque.
No drag racing for me.
Any suggestions?
Author:  Doc [ Wed Jun 04, 2008 10:07 am ]
Post subject: 
Here are the worksheets on the 2 RDP cams I engineered with Erson.
Both use the old Mopar 244 duration exhaust lobe cambined with Erson's "RV" lobes on the intake side . (RV10 & RV15)

These are mild street cams, with a smooth idle and lots of low-end.
1 bbl should use the RV10 / 244 and 2 bbl can handle the RV15 / 244 combo.

http://www.dutra.org/pictures/engine/er ... m-212-.jpg

http://www.dutra.org/pictures/engine/cam-260-244.jpg
Author:  ceej [ Wed Jun 04, 2008 10:46 am ]
Post subject: 
So Lash on the RV15 is 20/22 on the sheet.
The RV15M is carrying the 600 Holley just fine. I didn't get a bog with long yellow. We'll see how far I can go with it tomorrow.

It'll be interesting to adjust lash tonight. I'm going to use your method of adjusting to the ramp. The difference is quite a bit from your spec sheet and Erson's recommended lash. Maybe my motor will idle in a civilized manner! :D

Thanks Doug!

CJ
Author:  BMXICAN [ Wed Jun 04, 2008 10:48 am ]
Post subject: 
Quote:
Here are the worksheets on the 2 RDP cams I engineered with Erson.
Both use the old Mopar 244 duration exhaust lobe cambined with Erson's "RV" lobes on the intake side . (RV10 & RV15)

These are mild street cams, with a smooth idle and lots of low-end.
1 bbl should use the RV10 / 244 and 2 bbl can handle the RV15 / 244 combo.

http://www.dutra.org/pictures/engine/er ... m-212-.jpg

http://www.dutra.org/pictures/engine/cam-260-244.jpg
I think I would have to go with the RV15 / 244 combo, since I'd like a two barrel carb as well someday.
Author:  Doc [ Wed Jun 04, 2008 11:13 am ]
Post subject: 
Quote:
So Lash on the RV15 is 20/22 on the sheet.
The RV15M is carrying the 600 Holley just fine...
I always take any lash specs "under suspicion" until I run through the actual testing process that I showed you in Medford.
I have seen so much "mis-information" and just plain wrong lash advice that we should always confirm that the lash being used is correct for the lash ramp geometry that has been ground onto the cam.

It will be interesting to see how much the idle "settles down" when you give your RV15 more lash.
It will also be interesting to see how much RPM you can get out of that cam once you have a chance to play with some different lash settings. (loose exhaust & intake lash vs loose ext. / tighter int. lash)
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