Baffled by apparent reversion issues with Lightning headers and mild cam
06-08-2014 | 05:26 PM
#162
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From: On A Dirt Floor
You are correct - the numbers I listed from the card are at .050, so I guess the valve can actually be off its seat a lot sooner than that. I do know that this cam gets the valve open in a hurry. I don't have any numbers at .004 or .006.
Intake centerline is 110* ATDC, and exhaust CL is 118* BTDC. I'm far from an expert but I think that means the cam will be 4* advanced when installed "straight up". That's the way I did it - dot to dot, put a degree wheel, established true TDC with a pointer, and verified that the valve events with the wheel and a dial indicator. Also, the cam card says to install it "* *", which I would take to mean straight up.
Bob doesn't generally want to have the full specs for his cam posted on the web, and I can understand him wanting to protect his intellectual property. He has helped me out lot, so out of respect for him, I don't want to post the full specs out here on the WWW.
Intake centerline is 110* ATDC, and exhaust CL is 118* BTDC. I'm far from an expert but I think that means the cam will be 4* advanced when installed "straight up". That's the way I did it - dot to dot, put a degree wheel, established true TDC with a pointer, and verified that the valve events with the wheel and a dial indicator. Also, the cam card says to install it "* *", which I would take to mean straight up.
Bob doesn't generally want to have the full specs for his cam posted on the web, and I can understand him wanting to protect his intellectual property. He has helped me out lot, so out of respect for him, I don't want to post the full specs out here on the WWW.
A 114° LSA cam installed with a measured 114° ECL and 114°ICL when installed is 0 adv/retard.
A 114° LSA cam installed with a measured 110 ICL and 118 ECL. when installed is at 4° advance.
DOT to DOT does not mean straight up.Some cams are ground with advance cause they doubt the installer. LOL.
Straight up means ICL and ECL is installed at same numeral.
06-08-2014 | 09:58 PM
#163
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06-08-2014 | 10:34 PM
#164
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From: yorkville,il
in actuiality as the timing chain stretches the cam timing events falls back.that confuses a lot of people.many get crank&cam degreeing confused.
Last edited by mike tkach; 06-08-2014 at 10:38 PM.
06-09-2014 | 08:50 AM
#166
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I mentioned earlier that when I tested it with the tips installed, it stayed dry. I have to amend that to say that the last time I ran it over the weekend, it stalled on its own because I didn't notice that it was running out of gas (this thing eats gas at a fearsome rate. 
) When I pulled the pipes that time, there was some water in them. My guess is that it took a big gulp as it sputtered to a stop. I'm going to take the tips in to the exhaust shop today to have them modified to have one little nozzle spraying some water angled back towards the tips. Going to close the top ports off, and add a bung on the top to dump the excess overboard. I'll let everyone know how it works out.
) When I pulled the pipes that time, there was some water in them. My guess is that it took a big gulp as it sputtered to a stop. I'm going to take the tips in to the exhaust shop today to have them modified to have one little nozzle spraying some water angled back towards the tips. Going to close the top ports off, and add a bung on the top to dump the excess overboard. I'll let everyone know how it works out.
06-09-2014 | 10:07 AM
#167
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From: Further South East of Dome Island
I mentioned earlier that when I tested it with the tips installed, it stayed dry. I have to amend that to say that the last time I ran it over the weekend, it stalled on its own because I didn't notice that it was running out of gas (this thing eats gas at a fearsome rate. ) When I pulled the pipes that time, there was some water in them. My guess is that it took a big gulp as it sputtered to a stop. I'm going to take the tips in to the exhaust shop today to have them modified to have one little nozzle spraying some water angled back towards the tips. Going to close the top ports off, and add a bung on the top to dump the excess overboard. I'll let everyone know how it works out.
) When I pulled the pipes that time, there was some water in them. My guess is that it took a big gulp as it sputtered to a stop. I'm going to take the tips in to the exhaust shop today to have them modified to have one little nozzle spraying some water angled back towards the tips. Going to close the top ports off, and add a bung on the top to dump the excess overboard. I'll let everyone know how it works out.
06-09-2014 | 10:38 AM
#168
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Yeah, that's the trick, figuring out how much. I don't think it will take all that much, and I might get some of the high temp silicone hose to connect to the tips for insurance. It sure doesn't need the torrent of water that is going through them now.
06-09-2014 | 11:00 AM
#169
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From: Further South East of Dome Island
Still waiting someone to invent a jacketed (so cool exterior) totally dry stainless muffled exhaust that dumps water in at very end outside of boat that is a replacement fit for stock Merc setup.
