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Author Topic: Which cam would YOU pick?  (Read 2957 times)
modnrod
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Old School Volksies


« on: May 22, 2017, 10:39:17 am »

I'm building a new engine for when my little Super is on the road. I had a mild-but-sweet 1584 ready but a friend is using it, and that was only going to be an emergency runner anyway. I like small strokers and have decided on a 1745 (76 x 85.5). I was going to use my MV 76mm crank, but after a season of floods and mud it needs a bit of work unfortunately, so likely CB or Empi to the rescue (4140, 4340, a crankshaft anyway).

It has pocket-ported stock 35.5/32 heads, centremount 2BBL, decent exhaust, and initially it will be NA for a while until I get around to building all the stuff I need to then go small low-boost turbo blowthrough. Compression with stock AA 85.5 will end up at about 8.5:1, then with different pistons that have a 9cc dish and different pin height it will end up around 7.6:1, just by taking out barrel spacers and slotting in the pistons (oh, and pushrods too I guess!), no other change at all. Oh, except I might go for bigger valve springs, and maybe perhaps also ratio rockers. The turbo is tiny and I'm only going to run 10lbs max probably less. I expect 5500rpm NA and 6000rpm with pressure.
It's ALL about the overlap to be honest..........



I have in the shed.......
*   270/234/.330 Int // 266/228/.310 Exh on 111 LSA (beautiful on little 1600s btw, really nice around 3000).
*   284/250/.340 Int // 276/242/.315 Exh on 110 LSA (think ratio-rocker version of TCS10, sorta).
*   Engle FK-41
*   Norris 330S

.......and I'm thinking when I order the crankshaft I might add a CB #2239, possibly CB #2241, or even pick up an Engle FK-7 or FK-42 locally.

Sigh.

Decisions, decisions, decisions hey. Which hypothetical cam would YOU pick?



PS: credit to Peter Aschwanden for the pics.
 Cool

« Last Edit: May 22, 2017, 10:56:52 am by modnrod » Logged
richie
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« Reply #1 on: May 22, 2017, 17:19:13 pm »

Before I even got to your choices I had decided 41[on 112lobe centers] going on your other parts, make of that what you will  Grin

cheers Richie
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Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
modnrod
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Old School Volksies


« Reply #2 on: May 23, 2017, 00:32:34 am »

The FK41? Yep, proven in similar packages isn't it?

I wonder how the extra timing duration of the FK7/CB2241 would affect the rev range of operation, both in NA and turbo versions?

A V-26, a set of Panchitos and doubling the pressure would be interesting too I rekn!  Grin
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