Topic: 1.5:1 vs. 1.6:1 Rocker Arms ?????
in Forum: C3 Engines
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Lifetime MemberI need a little help here from some of you mathmatic wizards. I'd like to know what my gross cam lift would be after installing a set of 1.6:1 roller rocker arms.
Here's what I got now:
1.5:1 rockers, the intake lift is at .435 and .460 on the exhaust.
What would these numbers change to?
Duration-212 deg. intake, 222 deg. exhaust @.050"
Centerline-109 deg.ATDC intake,116 deg.BTDC exhaust.
And would I gain or lose power by going to 1.6:1 arms?
Thanks in advance for any assistance!
Sarge
Here's what I got now:
1.5:1 rockers, the intake lift is at .435 and .460 on the exhaust.
What would these numbers change to?
Duration-212 deg. intake, 222 deg. exhaust @.050"
Centerline-109 deg.ATDC intake,116 deg.BTDC exhaust.
And would I gain or lose power by going to 1.6:1 arms?
Thanks in advance for any assistance!
Sarge
TKO500 5 spd.
Borgeson Steering Box
Born 8/1981
Sequence #3975
Click here to see more pics of my Vette on CarDomain.
Lifetime Member #26
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the intake lift is at .435 (.435/1.5= cam lift of .290, .290x1.6= total lift of .464)
the exhaustis at 460 (.460/1.5= cam lift of 0.307, .307x1.6= total lift of .491)
the exhaustis at 460 (.460/1.5= cam lift of 0.307, .307x1.6= total lift of .491)
Brian - NCM Lifetime Member
73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System
Dewitt radiator and dual electric fans
Borgeson Steering box
Thank you Brian!
The formula makes total sense to me. Now I can plug in some numbers in my Desktop Dyno and see if there is a signifigant increase in power.
Sarge
The formula makes total sense to me. Now I can plug in some numbers in my Desktop Dyno and see if there is a signifigant increase in power.
Sarge
TKO500 5 spd.
Borgeson Steering Box
Born 8/1981
Sequence #3975
Click here to see more pics of my Vette on CarDomain.
Lifetime Member #26
I want a desktop dyno !!!
EdelBrock Performer w/ 750 doub pumper,port/polished heads, triple cut valves w/4th cut down the throat of the exhaust valves, 286 Comp Magnum cam, 1.6 roller rockers, ball-peen pushrods w/guides, screw in rocker studs w/girdles, Comp double-roller chain, , hi-rise valves covers w/ spacer (needed for the girdles), Flowtech by Holley long-tube ceramic coated headers into Stage II pipes (no cats), chrome wire looms for the MSD 8.5 mm wires, MSD 50,000v coil kit w/advance springs, cap, rotor, module, steel-braided radiator,heater,vacuum hoses, Infinity Kappa 4x6 plates (dash), Sony Xplode 6 3/4" (rear), chrome T-stat housing, A-arm shields, B&M Hammerhead shifter
|IMG||/IMG|
Hey Bill!
You can go to www.motionsoftware.com to check out and even order the program.
It's pretty cool. I've done a couple of actual engines using this program. They were then dyno'ed and were off by maybe 10 HP. Not bad. Save the hassle of guessing the best combination that suits you.
I found a camshaft setup that I will be putting in my vette using their program. I want my car to be a serious torque monster coming off the line. The cam I have in this crate motor just ain't getting it. All upper RPM range.
Sarge
You can go to www.motionsoftware.com to check out and even order the program.
It's pretty cool. I've done a couple of actual engines using this program. They were then dyno'ed and were off by maybe 10 HP. Not bad. Save the hassle of guessing the best combination that suits you.
I found a camshaft setup that I will be putting in my vette using their program. I want my car to be a serious torque monster coming off the line. The cam I have in this crate motor just ain't getting it. All upper RPM range.
Sarge
TKO500 5 spd.
Borgeson Steering Box
Born 8/1981
Sequence #3975
Click here to see more pics of my Vette on CarDomain.
Lifetime Member #26
Hi Sarge
I read an engine build up story in Chevy Hi Performance
magazine and they had to grind the push rod slots
for clearance with 1:6 ratio rockers. It was a newer
engine than yours but something to be aware of.
Steve
I read an engine build up story in Chevy Hi Performance
magazine and they had to grind the push rod slots
for clearance with 1:6 ratio rockers. It was a newer
engine than yours but something to be aware of.
Steve
Thanks Steve,
I would have to clearance out my pushrod opening. My engine was made 09AUG99. Topped with L31 Vortec heads. I think that they used a 1/2" drill bit to do that. I will have to find that article.
Sarge
I would have to clearance out my pushrod opening. My engine was made 09AUG99. Topped with L31 Vortec heads. I think that they used a 1/2" drill bit to do that. I will have to find that article.
Sarge
TKO500 5 spd.
Borgeson Steering Box
Born 8/1981
Sequence #3975
Click here to see more pics of my Vette on CarDomain.
Lifetime Member #26
Hi Sarge
They used a die grinder with the heads off to open up the pushrod slots onthe valve side of the head.Labor
intensive but low bucks! Let us know how it works out!
Steve
They used a die grinder with the heads off to open up the pushrod slots onthe valve side of the head.Labor
intensive but low bucks! Let us know how it works out!
Steve
in Forum: C3 Engines
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