Reply With Quotewhat sort of HP did you get from that conversion? is your testing done?
Thought I would just drop a quick thread to let 496 owners and engine builders know our new 496 intake manifold is out, along with our new camshafts and piston assemblies for the 496-8.1 engines. Check out these cool new pieces at www.raylarengine.com and let me know what you think!
Thanks,
Ray @ Raylar
what sort of HP did you get from that conversion? is your testing done?
Dave C:
Our dyno testing has been on many combinations. When we tested our aluminum heads, manifold, and our medium performance cam we found horsepower at 526hp at 5000rpms and torque peaking at 600ft/lbs at 4400 rpms. The really interesting result was that torque was 528ft/lbs at 2500 rpms and stayed over 540 ft/lbs to over 5300 rpms and the horsepower was over 515hp at 4800rpm to 520hp to 5300rpms. Kind looks like a diesel torque curve, and we know it will pull like a freight train. Boats that use this combo will accelerate faster, swing more prop and make more speed beacause the horsepower and torque are broad and not peaky like some efi engine packages that supposedly make more "advertised" horsepower. These numbers mirror outputs for horsepower from HP525 EFI engines and make more torque and will cost our customers a heck of a lot less money! We're excited hope you are too!
Thanks for the question
Ray @ Raylar
100 hp bolt on HP gain! Nice.
that torque curve is impressive.
BTW did you guys use headers or stock exhaust? If so which ones?
Originally posted by Raylar
Dave C:
horsepower at 526hp at 5000rpms and torque peaking at 600ft/lbs at 4400 rpms. The really interesting result was that torque was 528ft/lbs at 2500 rpms and stayed over 540 ft/lbs to over 5300 rpms and the horsepower was over 515hp at 4800rpm to 520hp to 5300rpms.
speaking of cost,what would a package like this run?
Raylar,
Are you going to need hyd. roller lifters and solid roller lifters for your project?
Chris
Chris:
All of our project so far has used the stock hydraulic roller. Our special conical-variable rate Eibach valve springs don't beat the hell out of them like all the other cam-spring packages do. We've been making 556HP on the dyno with over 140 pulls at 5200 to 5500 rpms and on tear down the lifters check out like new, no bent stock pushrods, springs test at 135lbs closed, 404 lbs open at .600 lift after the 140 pulls. Great products well engineered make the difference.
PS. We made most of these runs including the 556hp run on a stock Merc ECM! Our new heads and "CoolGap" manifold. The 496 will never be the same!
Regards,
Ray@Raylar
Now if you could just do something about those pistons
Our testing and expierence has shown that the pistons are not so bad as long as you don't hit them with detonation, especially with boost and detonation. In our tests with our new heads we turned timing up as far as 34 degrees and expierenced no detonation. We found the best power at 30 degrees and we had no piston problems or damage to the pistons or rings after all the 140 plus dyno pulls. I can't say this about the stock iron heads. The combustion chamber size and shape and head hot spots make the stock heads produce a lot of detonation at even lower timing numbers. Couple this with more power from boost ,add in a little more timing or weak fuel and you have a recipe for piston problems in this motor. This is really what's giving the piston a bad reputation. If its a real concern use our new Mahle forged pistons-No Problem!
Ray @ Raylar
Today we backed up our previous runs, retarded the cam 4 degrees and popped on a set of e-tops on the motor. We made 556HP @ 5200rpms on the stock Merc ECM with no reprogramming at all. Whew! This combo is awesome! The e-tops were an old set of CMI's that we ran without water. This is going to mean that for about $5800 ,496 owners can make more power and torque than a HP525EFI with bolt on parts and a helluva lot less money! Heck, paint all the parts black, put the Merc plastic engine cover back on and really mess with people's minds!
Ray @ Raylar
so does that mean the first test you mentioned (i.e. 526 hp) was using stock exhaust???..... or did you change them?
inquiring minds want to know.....
not that I want to use stock exhaust.
BTW does anyone make "good" exhaust for the 496 HO yet?
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