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12-14-2015, 07:36 PM | #1 |
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Cam shaft choices
Getting a handle on the right rear axle ratio & tire size for the '40 coupe to operate at 65 MPH or so as needed. The engine is a 59L 3&5/16" x 4". The axle ratio & tire size says that at 65 mph with a 3:78 rear axle & 7:00x16 tire, the revs should be around 2,700. What camshaft is recommended for that engine/chassis combo to put the torque curve in the 2,500 to 3,000 RPM range. No high rpms will be needed. From my experience with a vintage 23' boat weighing 4,000#s with a 351 Windsor, (Ford) engine, is that the torque sweet spot is right about my cruising speed rpm of 2,400 to 3,000.
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12-14-2015, 07:58 PM | #2 |
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Re: Cam shaft choices
Don't think you are going to beat the stock Ford cam unless there are a lot of other modifications.
Last edited by JSeery; 12-14-2015 at 08:22 PM. |
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12-14-2015, 08:03 PM | #3 |
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Re: Cam shaft choices
You can however beat the stock Ford brakes. Consider going to Lincoln (Bendix) style brakes to stop that car when going 65+
Stock 53 Merc cam would be good. |
12-14-2015, 08:30 PM | #4 |
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Re: Cam shaft choices
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12-14-2015, 08:32 PM | #5 |
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Re: Cam shaft choices
From the stoplight, stock Merc 8CM if you can find one. Next, through second gear and beyond is Isky 1007B. I think Pete can grind one for you. Be careful with a new grind from Isky. There was a member not long ago dialed-in a new Isky 1007B with a degree wheel and it was way off.
Edit: Oh, and there is Tony's L-100 too, but consumer reports say it's only fun over 30mph because it's kinda lumpy. Lonnie Last edited by Binx; 12-14-2015 at 08:47 PM. |
12-15-2015, 05:47 AM | #6 |
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Re: Cam shaft choices
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12-15-2015, 08:18 AM | #7 |
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Re: Cam shaft choices
I think you would be better off having a cam ground to 8CM specs that fits the crab dist.
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Tommy |
12-15-2015, 09:23 AM | #8 | |
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Re: Cam shaft choices
Quote:
If everything is going to be stock, I would call George at Clay Smith cams. Most of their grinds are relatively low lift and would clear stock heads. They still grind a fair number of different grinds for flatheads. |
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12-15-2015, 01:29 PM | #9 |
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Re: Cam shaft choices
yes local machinist charges $25 to do the conversion from 8CM to front mount
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12-15-2015, 01:34 PM | #10 |
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Re: Cam shaft choices
I couldn't agree more. Don't waste your money on anything but a stock ford camshaft on this arrangement. I know it sounds sexy to say you have a fancy camshaft grind but you won't benefit from it. I speak from experience.
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12-15-2015, 02:15 PM | #11 |
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Re: Cam shaft choices
I think Cruise RPM fir a flathead is in the 1800- 2400 range, at least, that's mine definition. That's not to say it can't be higher, I just don't want it screaming down the road just going someplace. I gear the car/truck accordingly. The difference between a stock early T-5 grind (Pre 49) cam and the EAB,8CM,1CM cams, would be hardly noticeable. These profiles are3 only a few thousandth higher with a re-arranged timing with approximately the same duration and lift. The valves were also equipped with rotators, and automatic transmissions were also available. So this project is $$$$$ rich, and performance poor.
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12-16-2015, 02:58 AM | #12 |
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Re: Cam shaft choices
Ron,
Could you clarify "performance poor" please, this refer to your 280? Thanks, Martin. |
12-16-2015, 06:18 AM | #13 |
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Re: Cam shaft choices
I now have the 280 on the road and have a chance to see it my idea of a good street engine was any good. The cam is an EAB, and the reason I used it is because I'm using rotators on the valves, but I don't think that's necessary now. Low end torque is better than expected, but I haven't had it in the hills, or checked fuel mileage yet. The truck is not meant for interstate running but the 36% OD should help there. As for the cam, I still don't think the differences between the other "STOCK" cams would have made a noticeable difference in performance. However, we'll never know, because I ain't changing it to find out.
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12-16-2015, 07:48 AM | #14 |
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Re: Cam shaft choices
I posted a pic awhile ago of what I call an inexpensive engine for a friend. He's putting it in a 40 coupe that he's building ground up. (50 Merc. 276, EAB cam, EAB heads, dual carbs,) I think this will be nice engine for his 40 coupe, T-5 trains, 3-78 gears I think. we'll know next summer. Walt
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12-16-2015, 11:05 AM | #15 |
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Re: Cam shaft choices
Walt, did you have to do any work to the EAB heads to clear the pistons? I just finished a set for my 276" and had to increase the dome width and take some off the top of the dome to get clearance with no head gasket. LOTS of time for an amateur to do it. The biggest problem was determining the contact spots . I finally used black shoe polish on the head chamber to see the contact spots on the pistons. There is probably something better, but this worked for me on getting clearance. They are not on the engine yet, hoping for even compression.
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12-16-2015, 04:09 PM | #16 | |
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Re: Cam shaft choices
Quote:
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12-16-2015, 06:50 PM | #17 |
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Re: Cam shaft choices
Edit: Oh, and there is Tony's L-100 too, but consumer reports say it's only fun over 30mph because it's kinda lumpy.
Lonnie Thanks Lonnie , yes I can supply you with a KiWi-100 cam , this grind has been used in many different engine combo's in many different weight body style Ford Flathead powered cars & trucks ,applications including cruisers to race cars , putting a smile on many a face from both the sound & all around "Great" performance ! Your question will for sure as you see get many answers & opinions . I also offer several other great flathead cam grinds from mild to wild ! Just a few being =_ stock Merc. grind ,Isky 1007LD , Isky 1016 , KiWi-Eliminator (Potvin) an more ... Please pm me should you need any further information . Cheers Tony |
12-16-2015, 06:58 PM | #18 |
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Re: Cam shaft choices
Commercial. I PM'd Tony for some dyno numbers on his cams, and got no reply. I'd go with a stock cam in a relatively heavy car like this.
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12-16-2015, 07:16 PM | #19 | |
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Re: Cam shaft choices
Quote:
The best information I have to offer is from the many great flathead builders that have used this cam & continue to use it over & over . The many happy customers I receive nothing but thanks from for once again making this great cam available . The real thanks probably needs to go to the Literio brothers & for sure the great Dave Generous !!! Cheers Tony |
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12-16-2015, 10:23 PM | #20 |
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Re: Cam shaft choices
Tony, can you post your specs on the Merc cam?
Thanks, Lonnie |
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