Dynamic Vs Static comp..
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,298
Likes: 1
From: Sodertalje/Sweden
Dynamic Vs Static comp..
Since i`ll be running a fairly high comp on my engine (11:1) i was told that thats the "Static comp" and with a healty cam you`ll bleed off some comp(Dynamic comp?).How do i figure out what the "real" comp is? :cheers:
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: Dynamic Vs Static comp.. (BB wowbagger)
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,443
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Dynamic Vs Static comp.. (BB wowbagger)
You have mail. I'm sending you the program. You need to know the seat to seat duration numbers off of your cam card.
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: Dynamic Vs Static comp.. (Fevre)
DCR is dependant on cam events (effective swept volume from TDC to where intake valve closes) The DCR is a fixed number, the cylinder pressure is dependant on rpm, intake & exhaust efficiency, temperature, athmospheric pressure.. yadda yadda.... The thing to watch with high static compression is that you don't get a cam that is so short it will give high cranking pressure at low rpm, you'll need a crank retard box for it then. To bleed off at low rpm you need a longer cam, that has more pumping loss.
[Modified by Twin_Turbo, 6:00 PM 7/2/2003]
[Modified by Twin_Turbo, 6:00 PM 7/2/2003]
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,443
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Dynamic Vs Static comp.. (BB wowbagger)
I don't like compCams or their web site. I find it difficult to get the cam card on your 288 roller cam
I see that they now claim one day custom ground cams. I would like them to tell me why mine took 42 days and I got charged for 3 cams. They claim to sell things that they don't really have.
[Modified by gkull, 3:43 PM 6/27/2003]
I see that they now claim one day custom ground cams. I would like them to tell me why mine took 42 days and I got charged for 3 cams. They claim to sell things that they don't really have.
[Modified by gkull, 3:43 PM 6/27/2003]
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,298
Likes: 1
From: Sodertalje/Sweden
Re: Dynamic Vs Static comp.. (gkull)
Yes ..their site suck..But the Summit Art nr is:CCA-11-692-8
Thanks for the prog..Sitting ang playing with it now :cheers: :cheers:
Thanks for the prog..Sitting ang playing with it now :cheers: :cheers:
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Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: Dynamic Vs Static comp.. (gkull)
There is a mech roller cam with a grind of 288AR-8 on this page. :confused:
http://www.compcams.com/catalog/108_109.html
http://www.compcams.com/catalog/108_109.html
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,298
Likes: 1
From: Sodertalje/Sweden
Re: Dynamic Vs Static comp.. (Fevre)
Heres some tech info from Summits site:
Specifications:
* Advertised duration: 288 intake/288 exhaust
* Duration at .050 in cam lift: 246 intake/246 exhaust
* Gross valve lift: .623 in. intake/.623 in. exhaust
* Lobe separation: 110 degrees
* RPM range: 2,200 to 6,500
* Great all-around power
* 3,000 plus stall with lower gear
* Use headers and 9.5:1 or higher compression
* Rough idle
:cheers:
Specifications:
* Advertised duration: 288 intake/288 exhaust
* Duration at .050 in cam lift: 246 intake/246 exhaust
* Gross valve lift: .623 in. intake/.623 in. exhaust
* Lobe separation: 110 degrees
* RPM range: 2,200 to 6,500
* Great all-around power
* 3,000 plus stall with lower gear
* Use headers and 9.5:1 or higher compression
* Rough idle
:cheers:
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: Dynamic Vs Static comp.. (BB wowbagger)
is that for dynamic compression? That indeed doesn't sound right, it should be somewhere between 75, and 8,5 for a street engine and about as hgh as 9 for a race engine. For it to be around 9 w/ a generic 290 cam you'd need a static compression of about 12:1