Re: Solid roller vs. Solid flat tappet
[Re: viperblue72]
#2272366
03/19/17 02:43 PM
03/19/17 02:43 PM
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Joined: May 2012
Posts: 72 sioux falls, sd
10sec.dart
member
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member
Joined: May 2012
Posts: 72
sioux falls, sd
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Ive been running a hughes solid flat tappet for 8 years now, using their cool face light weight lifters, ive gone 9.79 at 139 with it shifting at 7000 crossing about 7300 in a small block, it has lived so far,use the right oil and you shouldn't have a problem, I change springs once a year just for peace of mind, ive considered going roller but I don't want to have to grind my rocker arms for the bigger springs, plus the bigger springs take horse power to compress,
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Re: Solid roller vs. Solid flat tappet
[Re: viperblue72]
#2272369
03/19/17 02:49 PM
03/19/17 02:49 PM
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Joined: Jan 2003
Posts: 4,293 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,293
Morrow, OH
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I went from a .650 lift flat tappet to a more aggressive roller but also went from 12.5 to 14:1 compression at the same time. Went from low 9.80's to low 9.60's.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Solid roller vs. Solid flat tappet
[Re: viperblue72]
#2272792
03/20/17 05:36 AM
03/20/17 05:36 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
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Posts: 27,421
Balt. Md
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I also use the EDM lifters on mine. And I had no problems breaking in the cam as we left the inner springs off to break in the cam. I used Valvoline VR1 racing oil and a bottle of the Comp Zink additive. I also used the cam break-in lube on all my lobes. No problems at all and its been in the car since 2011. Dwayne Porter speced me a custom grind cam and it was no more then an off the shelf cam was. He has good prices and does awesome work. I wanted a custom grind since I run 92 pump and I wanted some power but had to keep the cyl pressure below 190. And it has never pinged with 37 total timing. Ron
Last edited by 383man; 03/20/17 05:37 AM.
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Re: Solid roller vs. Solid flat tappet
[Re: dmking]
#2275100
03/23/17 11:58 PM
03/23/17 11:58 PM
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Joined: Feb 2005
Posts: 4,324 Prospect, PA
BSB67
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master
Joined: Feb 2005
Posts: 4,324
Prospect, PA
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moved the cam from 104 in steps to 110. took it from 10.70s to best of 9.89@134mphit
Wait. What are you saying here? Are you talking about the cam ICL?
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Re: Solid roller vs. Solid flat tappet
[Re: viperblue72]
#2276584
03/26/17 04:21 PM
03/26/17 04:21 PM
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Joined: Jan 2003
Posts: 14,515 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,515
So. Burlington, Vt.
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An "extra" $1400 to run a roller cam??
I guess I don't see how the math works out there.
Solid flat tappet cam, nitriding, edm lifters = about $525
Mild roller cam, mid-level lifters, price of bronze gear over iron gear = about $1200
Looks like about $650-700 difference to me.
If you were okay with more entry level lifters(which are fine for many mild roller race applications), then the cam and lifters are under $750.
Comp Cams 23-758-9 cam = $337 Howard's 91727 roller lifters = $380
Mid-level upgrade lifters: Crane 66542-16 Ultra-pro = $788 Comp Sportsman 96829-16 = $689
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Solid roller vs. Solid flat tappet
[Re: fast68plymouth]
#2277434
03/27/17 11:34 PM
03/27/17 11:34 PM
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Joined: Aug 2006
Posts: 2,141 junction city oregon
viperblue72
OP
top fuel
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OP
top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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An "extra" $1400 to run a roller cam??
I guess I don't see how the math works out there.
Solid flat tappet cam, nitriding, edm lifters = about $525
Mild roller cam, mid-level lifters, price of bronze gear over iron gear = about $1200
Looks like about $650-700 difference to me.
If you were okay with more entry level lifters(which are fine for many mild roller race applications), then the cam and lifters are under $750.
Comp Cams 23-758-9 cam = $337
Howard's 91727 roller lifters = $380
Mid-level upgrade lifters: Crane 66542-16 Ultra-pro = $788 Comp Sportsman 96829-16 = $689
Dwayne, I already have ductile rockers that would work for a solid flat tappet and correct length pushrods. Therefore I added the cost of roller rockers and pushrods on top of everything you accounted. If it were a fresh build and I already needed rockers and pushrods, your thinking is correct. The difference is much less in that case. Thank you for your input.
Last edited by viperblue72; 03/27/17 11:43 PM.
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Re: Solid roller vs. Solid flat tappet
[Re: mopar dave]
#2277695
03/28/17 02:01 PM
03/28/17 02:01 PM
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Joined: Mar 2008
Posts: 883 Affton MO
qwkmopardan
super stock
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super stock
Joined: Mar 2008
Posts: 883
Affton MO
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just curious to what the lobe sep is on the stx-22 BB cam and where you installed it? thanks I don't remember exactly. But most BB STX-22 are 106/108 and intake C/L 103/104, but I usually set them at 101/102. IIRC the Lebaron cam is 107 LS.
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Re: Solid roller vs. Solid flat tappet
[Re: viperblue72]
#2277759
03/28/17 03:35 PM
03/28/17 03:35 PM
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Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,213
New York
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"Equivalent grinds" between FT and RT, as in, the same valve curtain area at all points of lift, is physically impossible unless both are so mild you would never use them. Even similar average areas will not have the same vacuum, inertia load, and reversion characteristics. The maximum acceleration and velocity are different, and especially different between roller at low lifts (which has the dangerous side thrust vector) and higher lifts (where the FT is limited by its contact length).
Boffin Emeritus
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