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Author
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Topic: When does it help to take timing out of Cleveland as RPMs' increase?
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f100cleveland
Gearhead Posts: 363
From: St. James, MN
Registered: Sep 2004
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posted 08-11-2005 12:41 AM
   
I was doing some reading and read that a n/a small block Ford will make more power if you pull some timing out on the top end. Is this true? I have a MSD Digital 6 Plus box and I can pull timing out as the revs increase. If it is true, at what RPM do you take "x" degrees of timing out? This is for a 357 Cleveland, 4v heads, about 10.8:1 compression, 242/244 @0.050 cam. If you need more specs, click on the link. Thanks------------------
1982 Ford F100 2wd Shortbox. Powered by a 357 Cleveland w/ closed chamber 4v's and a Funnelweb. Full Roller c-6 trans with Gear Vendors Overdrive and 4.86 geared Detroit Locker equipped 9" rear. 1982 F100 351c 4v 1977 F150 460 Burnout Truck
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kid vishus
Gearhead Posts: 6405
From: middle of NC
Registered: Oct 2000
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posted 08-11-2005 07:43 AM
I found all my clevelands loved timing. The more I threw at them, the quicker they ran, and the faster the mph got. I beleive that most articles that talk about NA smallblock Fords are talking about inline valve heads (windsor heads), not canted valve heads like a cleveland has. That changes the shape of the chamber and therefore changes the burn characteristics and that is what really determines how much timing a motor wants.
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Hans olsson
Gearhead Posts: 718
From: Sweden
Registered: Apr 2000
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posted 08-11-2005 03:11 PM
I agree with the Kid!
You need at least 40 Degrees at all times.
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- VIN 1F05M139343
- 71 Mach 1 Ram-Air
- 351C 4V 285 HP
- F-G/Stock Aut
- Stockers are way cool!
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f100cleveland
Gearhead Posts: 363
From: St. James, MN
Registered: Sep 2004
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posted 08-12-2005 01:45 AM
Hans, are you saying with a flat topped, closed chamber Cleveland, I should be running more than 40 degrees total advance? I thought that combo always like about 36-38?------------------
1982 Ford F100 2wd Shortbox. Powered by a 357 Cleveland w/ closed chamber 4v's and a Funnelweb. Full Roller c-6 trans with Gear Vendors Overdrive and 4.86 geared Detroit Locker equipped 9" rear. 1982 F100 351c 4v 1977 F150 460 Burnout Truck
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70rancheroGT
Journeyman Posts: 25
From: Durham, NC
Registered: Mar 2005
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posted 08-12-2005 02:21 PM
My flattop, 4V-CC, 10.7:1, Cleveland made more power on the dyno with 34 degrees total than it did with 38. My cam is quite a bit smaller than yours at 228/236 with 544/566 lift. 175psi cranking. Mine always revs faster between 5800-6300 with less total timing.
KidV, were they flat top motors that you are talking about? Didn't KK's motor make more power with less timing?
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Hans olsson
Gearhead Posts: 718
From: Sweden
Registered: Apr 2000
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posted 08-12-2005 03:10 PM
Ours made the most hp with 40 and seems to run even better with more timing at the track.Maybe something with the fuel,we use VP CSP unleaded race fuel.
11:1 comp with more than 260 @0.050. ------------------
- VIN 1F05M139343
- 71 Mach 1 Ram-Air
- 351C 4V 285 HP
- F-G/Stock Aut
- Stockers are way cool!
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7DMACH1
Gearhead Posts: 2646
From: PHILA. PA.
Registered: Feb 2001
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posted 08-13-2005 01:54 PM
I'm running 42 in my 408c. ------------------
SUPPORT OUR TROOPS CRUISE NIGHT WEB SITE
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kid vishus
Gearhead Posts: 6405
From: middle of NC
Registered: Oct 2000
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posted 08-14-2005 10:23 AM
quote:
Originally posted by 70rancheroGT:
KidV, were they flat top motors that you are talking about? Didn't KK's motor make more power with less timing?
No, I've never had any good flat top motors. The only one I ran ran was a standard rebuild 2v motor. KK's motor made more power with less timing, but it's a flat top pump gas motor with close to 11.5-1 compression and it has windsor heads on it. So the chamber shape is nothing like a cleveland and it's not a good comparison.
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