B B, the jump from duals can be a hard one. That's affirmed. You can get decent or better torque with some good combinations though.
When the 598 cam was in with the old (crappy) heads and duals it came in late. There was torque. But it didn't pull hard until 4k. Until then it was a nice grandma station wagon slowly accelerating up the onramp.
Looking at the specs of that cam it could have done better. The delay was in the rest of the motor and not that cam. At least that's what I always thought. That's why I used that cam when I did. I could band aid the prior mess (and it did quite adequately) and then be a very good choice for the rest of the Resurrection. A very good choice with my combination now it does seem to be.
Am looking forward to the gold SERK's experiences with the cam and exhaust and the rest of it. The figuring things out is sometimes half the fun.
Don,
My back went south on me at work lifting a box of metal placards I needed to deliver to the newest DDG in town so I came home to take some goofy pills and low and behold there was the UPS guy in my driveway. Good thing I came home as Mackie told him signature only, no signature, no dropoff. S'anyway, of course I opened the boxes. Those are sweet looking heads and man those pistons should be worn as jewelry. Bling bling. The Diamond Cut looks nice on the cylinders and heads too. Got the cams, the Fueling Rivera oil pump, Rivera lifters, gaskets - - - ole Bubba's wallet's gotta be light today hahahahaha
Anyway, yes the figuring everything out is fun, but one thing 18 years of doing business with Mackie has proven to me is that what you get from him is dead on and the only figuring you need to do are the parts he wasn't involved with. So off to the machine shop with the TB for boring and off to O'Harley's for me and Bubba_T on Friday so I can get him good and swacked and order the 2 into 1 exhaust setup before he sobers up.
FYI to folks reading this. A Mackie top end installed on a 88" TC motor pushes CI up to 95" and produces (even with an M&M TB and ignition) and a White Bros 2 into 1 exhaust 108 TQ and 106 hp with the TQ hitting 100 at just below 3,500 and the HP maxing at 5,500. These numbers were verified by American Rider some time back in a tech article. Both Twolane's motor and Bubba_T's started out at 103 CI with Twolane's build being different from what Bubba_T is doing in that he used Axtell cylinders bored out to 107" and a better TB and went with the D&D's from the get go. Don's already posted some sweet numbers on this thread which we'll see solidify when he gets his clutch issue straightened out. I'm expecting 130/130 on his build. Bubba's build is a set of stock CVO 103" cylinders punch out .040 over. I'm hoping for 120/120 which I know will make Bubba happy since he was around 98/92 when we started.
I'm not trying to
Don's thread here, but the two builds are similar in many ways - the biggest similarity being the Dave Mackie Heads valves,springs, keepers, pistons, rings,cams, cam plates etc and of course Mackie's machine work. Mackie buys piston blanks from JE pistons and machines them to his own special set of specs. When you buy a setup like this from Mackie everything has been fit and fit together with the exception being the engine builder has to gap the piston rings. I figure with the two builds being so close, keeping them both on the same thread will give folks a comparison on going with a set-up like Don or one like Bubba_T I will report how this goes as we get Bubba_T's 03 SERK back together, heat cycled ridden some and finally on the dyno.
B B
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Topic: It's ALIVE (Read 41350 times)