Subject: Re: HSR, what can it do by ultraviolet70 on 2009/9/2 3:59:41
Quote:
BeachBum wrote: Quote:
ultraviolet70 wrote:
"I'm having trouble finding solid info on the capabilities of the HSR. I know the HSR produced 2006 and later can opened to a Felpro 1206 and be ported to flow in excess of 300cfm, but I can't find any info that tells me how much.?
Whats the largest cubed engine you or you have heard of/seen the HSR sitting on?
How much horsepower can the HSR support (no boost/no nitrous)?
You ask good questions in your post, in which I too have searched for more information on the HSR, particuarily on big cube sbc applications.... I have come up empty though. I think there are a few 383's running them.....
Thus, I rely on my own intuition on the intake, and I think its a good intake that can make very good power, while maintaining decent mid-range torque.... even on a big cube 420+ sbc. I would guess, with good cylinder heads 11-1 cr, 427 sbc and a hyd roller cam in that 242-246 area, I think it could make 570-590 HP and 540 ftlbs of torque in at 4500 and 6000 rpm......
But, that is guesswork. If I ever find one that will fit under the hood and the owner will let me borrow for a week or two, I'll find out how it compares against the MR. I'll do the same for a efi SP as well. Could be interesting before and after A-B-A tests.
Please share anything you discover on the intake in the future as far as big cube performance.
Thanks Beachbum. I know as Anesthes says there are alot of threads on TGO (and believe me after all the research I've done I know he's right), but I wouldn't say it's been beat to death otherwise these questions would have had answers and I wouldn't have started threads on it (I did numerous searches, not only on TGO but all over and couldn't find definitive answers, if anyone can, please feel free to post links). I've been doing some more research and what I've come up with is it isn't so much a plenum volume issue (as you can see with the carb style top feed plenum Vettrock is using there is actually less plenum volume his than with the traditional style Strealth Ram plenum). I have a friend that is playing with a cad program the can simulate flow characteristics (it's a bit basic but makes sense) and the biggest problem (as many have mentioned) is with the front feed plenum the rear cyl end up rich due to the front cyl being able to pull the nec airflow before it reaches the back of the plenum. Reshaping the plenum changed the airflow and can solve the problem but the hood clearance problem is even worse as the front of the plenum height has to be raised significantl. Even though I'm not planning this for the Vette it is going to take a front feed plenum that sits awfully high in the front, almost as tall as a top feed intake and once I'd factor in the cost of a one off hand made and most likely gaudy plenum I might as well plan on the single plane.
I'd still love to figure out how to make a Stealth Ram work on this future build, but the cost and complexity is making me lean more and more towards planing this around a fuel injected single plane.
