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05-25-2024, 02:26 PM
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#1 |
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Junior Member
Join Date: Oct 2023
Location: Canuckistan
Posts: 28
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8Ba with Big Cam idle/hg
I have a Mark Kirby, Motor City Flatheads motor from 1994 that was a garage find, no miles unused.
We disassembled & confirmed all components. I am running an Offenhauser 4 barrel intake with a Holley 8007 390 cfm 4 barrel. I have an small cap HEI non vacuum distributor. Cam specs are intake 28-73 / exhaust 73-29 ; .420 lift, 272 duration I have about 6 hg inches at idle of vacuum 7* initial timing; mechanical advance only, see timing pict. idles about 950 rpm , T5 5 speed & 3.73 rear axle ratio Just working through a tune, my 1st flatty |
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05-25-2024, 03:05 PM
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#2 |
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Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 11,049
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Re: 8Ba with Big Cam idle/hg
Looks great. You were fortunate to have found that MCF engine. It's a collectible. Mark was a great flathead guy.
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05-25-2024, 03:37 PM
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#3 |
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Senior Member
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,546
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Re: 8Ba with Big Cam idle/hg
Need to be running around 12 deg initial and back off some of the mechanical advance in the distributor.
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05-25-2024, 03:42 PM
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#4 |
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Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,257
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Re: 8Ba with Big Cam idle/hg
Looks like you should have about 25 degrees total advance - all in early. That part is good, though as FlatJack noted, you could lower the mechanical and add some initial timing. The max you want is about 24 - 25 degrees (all in). Hopefully you have an adjustable timing light as well as a TDC marker so you can actually figure out what the real timing is - as I don't trust any "chart" to be accurate.
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05-25-2024, 05:30 PM
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#5 |
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Senior Member
Join Date: Aug 2020
Posts: 157
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Re: 8Ba with Big Cam idle/hg
Your vacuum seems very low. I have a cam with roughly the same duration. My vacuum is 18" and pulsing because of the inlet valve opening early. Cam is "Hotrod" or similar name, around 274 degrees, bought from H&H.
Not very practical for street use. |
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05-25-2024, 06:16 PM
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#6 | |
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Senior Member
Join Date: May 2015
Posts: 8,605
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Re: 8Ba with Big Cam idle/hg
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Quote:
__________________
The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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05-25-2024, 08:43 PM
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#7 |
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Senior Member
Join Date: May 2010
Location: NJ
Posts: 6,276
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Re: 8Ba with Big Cam idle/hg
Man, what a great looking motor! Congrats. You've come to the right place.
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05-26-2024, 08:57 AM
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#8 |
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Senior Member
Join Date: Jan 2011
Location: Central Ohio
Posts: 5,257
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Re: 8Ba with Big Cam idle/hg
I second what Tim says - a great looking engine and very well sorted out engine compartment. Very nicely done!
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05-26-2024, 01:39 PM
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#9 |
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Senior Member
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 2,096
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Re: 8Ba with Big Cam idle/hg
Beautiful!
What's up with the water pump/generator belt?
__________________
Archives of historical but relevant older articles: ------------- Hover mouse over the links below and click! ~~~~~~~~~~~~~~~~~--------------- Rumble Seat's Notes Techno-Source for the 1932 thru 1953 Flathead Ford |
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05-26-2024, 02:58 PM
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#10 |
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Senior Member
Join Date: Dec 2010
Location: East Coast in CT
Posts: 1,563
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Re: 8Ba with Big Cam idle/hg
As others have written definitely a great looking engine and great find.
One detail has me wondering the 390 CFM carb is rather small. From my experience it would be a lot better with 500 to 600 CFM. Another area of concern is the oil filter I prefer Motorcraft FL-1A filters especially the way the MCFH oil system is designed with the feed oil line coming directly from the oil pump cover. The FL-1A flows oil with less restriction since the passages are ovals {more open area} compared to the round holes found on many oil filters. Ronnieroadster
__________________
I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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05-27-2024, 01:31 PM
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#11 | |
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Junior Member
Join Date: Oct 2023
Location: Canuckistan
Posts: 28
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Re: 8Ba with Big Cam idle/hg
Quote:
Ill look into that filter idea for next time I change oil. Thanks |
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05-27-2024, 01:32 PM
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#12 | |
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Junior Member
Join Date: Oct 2023
Location: Canuckistan
Posts: 28
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Re: 8Ba with Big Cam idle/hg
Quote:
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05-27-2024, 06:16 PM
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#13 | |
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Senior Member
Join Date: Apr 2019
Location: Kansas
Posts: 1,013
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Re: 8Ba with Big Cam idle/hg
Quote:
Looks good from here. In fact the whole thing looks great! The 390 carb won't make it run lean if it's too small (quite the opposite in fact) but might limit power at the top end if the engine can handle more.
__________________
"It don't take but country smarts to solve the problem" (Smokey Yunick) '41 Merc Town Sedan / 260" 8CM engine '66 Fairlane four door / "warmed up"  302
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