Valve spring requirements
Thread Starter
Burning Brakes
Joined: Apr 2001
Posts: 904
Likes: 0
From: Langley, BC, Canada
Valve spring requirements
I posted this in c4 tech, but i'd figure i'd try here too
Spring requirments for Summit cam sum-k1102 cam.
Specs are
Advertised duration I:262 E:272
0.050 I:204 E:214
lift I:420 E:442
I ordered one of these cams which showed up today, so far im very pleased with it. The spring requirements section of the cam card is blank. Im considering the edelbrock performer sure seat springs due to the price and because the cam i ordered is a near clone of the edelbrock performer cam, and these springs are designed for it.
I'll also be adding a set of 1.6 rockers which will give me a 0.470 exhaust lift.
From what i worked out the springs have an installed height of 1.700" and a bind of 1.130" giving a 0.570 lift, and taking 0.06 off for safety im good for 0.510. Im I correct in my statement?
Any advice would be great! Thanks.
Spring requirments for Summit cam sum-k1102 cam.
Specs are
Advertised duration I:262 E:272
0.050 I:204 E:214
lift I:420 E:442
I ordered one of these cams which showed up today, so far im very pleased with it. The spring requirements section of the cam card is blank. Im considering the edelbrock performer sure seat springs due to the price and because the cam i ordered is a near clone of the edelbrock performer cam, and these springs are designed for it.
I'll also be adding a set of 1.6 rockers which will give me a 0.470 exhaust lift.
From what i worked out the springs have an installed height of 1.700" and a bind of 1.130" giving a 0.570 lift, and taking 0.06 off for safety im good for 0.510. Im I correct in my statement?
Any advice would be great! Thanks.
Race Director
Joined: Mar 1999
Posts: 10,258
Likes: 1
From: Calif.
Re: Valve spring requirements (nsimmons)
What does Summit say?
How about checking the specs from Comp, Lunati, Crane, etc., until you find what the cam really is and then see what is recommended.
Otherwise you're probably OK with your stock springs if the mileage is reasonable. That's not the biggest cam in the world.
How about checking the specs from Comp, Lunati, Crane, etc., until you find what the cam really is and then see what is recommended.
Otherwise you're probably OK with your stock springs if the mileage is reasonable. That's not the biggest cam in the world.
Thread Starter
Burning Brakes
Joined: Apr 2001
Posts: 904
Likes: 0
From: Langley, BC, Canada
Re: Valve spring requirements (The Dude)
i emailed summit no response yet. I think the stock 84 springs bind at .470, but the crossfire forum is down and i cant confirm this, mileage is 150k, i think new springs are in order
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Valve spring requirements (nsimmons)
Your math is right. I've always ordered springs and retainers as a set and just ask for some max lift number and close seat pressure. A cam that mild would work well with something right around 100# closed with low .500 max lift
Thread Starter
Burning Brakes
Joined: Apr 2001
Posts: 904
Likes: 0
From: Langley, BC, Canada
Re: Valve spring requirements (gkull)
heres the email from summit, the response is near the top
Discussion Thread
---------------------------------------------------------------
Response (Brad) - 05/24/2002 07:41 PM
You are correct in both your spring selection, and your method of determining the lift the springs are capable of.
Customer (Nick Simmons) - 05/24/2002 02:56 AM
Spring requirments for sum-k1102 cam.
I ordered one of these cams which showed up today, so far im very pleased with it. The spring requirements section of the cam card is blank. Im considering the edelbrock performer sure seat springs due to the price and because the cam i ordered is a near clone of the edelbrock performer cam. I'll also be adding a set of 1.6 rockers which will give me a 0.470 exhaust lift.
Will the performer springs (PN EDL-5802) be ok for my setup? From what i worked out the springs have an installed height of 1.700" and a bind of 1.130" giving a 0.570 lift, and taking 0.06 off for safety im good for 0.510. Im I correct in my statement? Any advice would be great! Thanks.
Discussion Thread
---------------------------------------------------------------
Response (Brad) - 05/24/2002 07:41 PM
You are correct in both your spring selection, and your method of determining the lift the springs are capable of.
Customer (Nick Simmons) - 05/24/2002 02:56 AM
Spring requirments for sum-k1102 cam.
I ordered one of these cams which showed up today, so far im very pleased with it. The spring requirements section of the cam card is blank. Im considering the edelbrock performer sure seat springs due to the price and because the cam i ordered is a near clone of the edelbrock performer cam. I'll also be adding a set of 1.6 rockers which will give me a 0.470 exhaust lift.
Will the performer springs (PN EDL-5802) be ok for my setup? From what i worked out the springs have an installed height of 1.700" and a bind of 1.130" giving a 0.570 lift, and taking 0.06 off for safety im good for 0.510. Im I correct in my statement? Any advice would be great! Thanks.
Drifting
Joined: Dec 1999
Posts: 1,462
Likes: 1
From: Reno nevada
Re: Valve spring requirements (nsimmons)
You really need to be asking what is the spring pressure at the installed height. Some very mild cams with 5500 or so red line run as low as 85-90#. With 1.6 rockers you might want to be in the 100-110# range if you plan on spinning it to 6000. You better off with the lightest retainers and springs run cooler(last longer) if your way above on the max lift req.
Stiffer springs will prevent valve float and they are not really any additional load on the cam. Always run a good chain.
Stiffer springs will prevent valve float and they are not really any additional load on the cam. Always run a good chain.
