Selecting a manifold for AFR 265's - single versus dual plane - thoughts anyone?
02-25-2014, 12:09 PM
#21
I agree.
What I wanna know is, when are these oso 496 stroker builds gonna hit the dyno. It seems like since 2012, we been trying to figure them out. To stroke or not to stroke, I beam or H beam, small ovals, or small rectangles, dual plane or single plane, crane or scorpion rockers, 750 or 850 holley, 496 manifolds or Gil manifolds, DUI or Merc or MSD?. Budman, Borgie, couple others. I wanna see some dyno numbers! What you guys building over there, some space shuttles? Put a fukin intake on it already and lets go!
What I wanna know is, when are these oso 496 stroker builds gonna hit the dyno. It seems like since 2012, we been trying to figure them out. To stroke or not to stroke, I beam or H beam, small ovals, or small rectangles, dual plane or single plane, crane or scorpion rockers, 750 or 850 holley, 496 manifolds or Gil manifolds, DUI or Merc or MSD?. Budman, Borgie, couple others. I wanna see some dyno numbers! What you guys building over there, some space shuttles? Put a fukin intake on it already and lets go!
02-25-2014, 12:40 PM
#25
Registered
I agree.
What I wanna know is, when are these oso 496 stroker builds gonna hit the dyno. It seems like since 2012, we been trying to figure them out. To stroke or not to stroke, I beam or H beam, small ovals, or small rectangles, dual plane or single plane, crane or scorpion rockers, 750 or 850 holley, 496 manifolds or Gil manifolds, DUI or Merc or MSD?. Budman, Borgie, couple others. I wanna see some dyno numbers! What you guys building over there, some space shuttles? Put a fukin intake on it already and lets go!
What I wanna know is, when are these oso 496 stroker builds gonna hit the dyno. It seems like since 2012, we been trying to figure them out. To stroke or not to stroke, I beam or H beam, small ovals, or small rectangles, dual plane or single plane, crane or scorpion rockers, 750 or 850 holley, 496 manifolds or Gil manifolds, DUI or Merc or MSD?. Budman, Borgie, couple others. I wanna see some dyno numbers! What you guys building over there, some space shuttles? Put a fukin intake on it already and lets go!
02-25-2014, 12:42 PM
#26
Going to run it on a startup cart before it makes any trips to the dyno. Would be just my luck to fork out $4-600 for the dyno time and drive several hours only to find some kind of an issue. I built this thing myself, so it's not like I can go after someone else if I start it up and have a rod knocking.
I have a dyno right around the corner from where I work, but he runs only racing fuel, so it's not going to be very helpful for my tune. Whole 'nother thread on that one.
Hoping for around 575 HP with wet exhaust and accessories. Same cam is running in a 502 with stock 088 heads, Air Gap, and Stainless Marine exhaust and it made around 530 with wet exhaust and accessories on it. Wasn't a "west coast dyno", but can't vouch for the numbers personally.
02-25-2014, 12:57 PM
#27
Registered
iTrader: (1)
On water with different motors as far as intakes, intake gaskets (small blocks), oil valley trays (sbc/bbc) and etc,etc. 350's, 383's, 454's, 496's, 502's....................
I posted my answer.
Run the Dart Oval Single plane (on the motor thread starter building) and worry about other things.
But, internet advice is free advice. So treat it that way. I understand.
02-25-2014, 01:10 PM
#28
Registered
Valid point, Mike. Honestly, I would like to maximize my part throttle cruising speed, say at 3400 RPM or so. However, that's easier to do with a car that has multiple gears in the tranny. In a boat, I can throw a bigger prop on there to try to take advantage of a big torque number in the mid-range, but then I might not be able to spin that prop at the top end. At what point am I "lugging" the motor? Seems that I read somewhere that you try to prop so your WOT max RPM is about 1000 RPM above the torque peak. Is that correct?
I used to be more worried about a big number for the top speed, but now I realize that someone is always going to be faster, so I'm not as worried about it. I use this boat for a lot of things besides running flat out - it even sees duty slinging the kids around on a tube sometimes.
I also want to be able to hit the diverter occasionally and run it through the prop to quiet it down. Most of the time this will be at lower cruising speeds between 2800-3200 RPM, but I could see where it would be nice to quiet it down at idle too. That's why I asked about a dual plane as a hedge against reversion, since the sequential cylinders in the firing order are not drawing in charge right next to each other in the plenum. Anyone have any experience with this?
I realize I have a lot more compromises in my setup than the average performance enthusiast on this site. That's why I'm spending so much time deciding.
I used to be more worried about a big number for the top speed, but now I realize that someone is always going to be faster, so I'm not as worried about it. I use this boat for a lot of things besides running flat out - it even sees duty slinging the kids around on a tube sometimes.
I also want to be able to hit the diverter occasionally and run it through the prop to quiet it down. Most of the time this will be at lower cruising speeds between 2800-3200 RPM, but I could see where it would be nice to quiet it down at idle too. That's why I asked about a dual plane as a hedge against reversion, since the sequential cylinders in the firing order are not drawing in charge right next to each other in the plenum. Anyone have any experience with this?
I realize I have a lot more compromises in my setup than the average performance enthusiast on this site. That's why I'm spending so much time deciding.
02-25-2014, 01:12 PM
#29
I did 502 with same sort of cam, decent afmkt heads, on the dyno with full wet exhaust. Different intakes, with/without this and that accessory, and etc,etc
On water with different motors as far as intakes, intake gaskets (small blocks), oil valley trays (sbc/bbc) and etc,etc. 350's, 383's, 454's, 496's, 502's....................
I posted my answer.
Run the Dart Oval Single plane (on the motor thread starter building) and worry about other things.
But, internet advice is free advice. So treat it that way. I understand.
On water with different motors as far as intakes, intake gaskets (small blocks), oil valley trays (sbc/bbc) and etc,etc. 350's, 383's, 454's, 496's, 502's....................
I posted my answer.
Run the Dart Oval Single plane (on the motor thread starter building) and worry about other things.
But, internet advice is free advice. So treat it that way. I understand.
That's where those 9 ambers come in. 
