why r mer's engs making more hp that jc's @
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Re: why r mer's engs making more hp that jc's @
mer has a well matched combination, the camshaft compliments the heads and blower so max power is below 6000 rpms. using a big cam to try and make big numbers,
causes the engine to have a narrow power band & kills midrange torque. jc's engine is more suited to drag racing than boating. it's easy to make good peak numbers but it's a lot harder to make big numbers below 6000 & have a nice flat torque curve. congratulations mer
causes the engine to have a narrow power band & kills midrange torque. jc's engine is more suited to drag racing than boating. it's easy to make good peak numbers but it's a lot harder to make big numbers below 6000 & have a nice flat torque curve. congratulations mer
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Re: why r mer's engs making more hp that jc's @
Originally Posted by ratman
i was always under the impression that big high flowing heads make power up high...where in this instance the big high flowing heads are make power at a lower rpm. i am not looking at total hp but where its being made, i just don't understand why a boater would want to twist a motor that hard to make power, i just cant see any benefit in reving almost 7 grand from a longevity stand point.
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Re: why r mer's engs making more hp that jc's @
Mark has worked real hard on his packages, and does a fair amount of testing. He has made mutiple changes to find what works the best. He's actually left some peak HP on the table in the name of curve, and drivability. He still has small flange carburetors on Fred's engines, going to a pair of King Demons would pick the numbers up even more. As stated before the entire package, or combination is the thing.
#14
JC Performance Engines
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Re: why r mer's engs making more hp that jc's @
Yes, combination is the thing. But $ is a factor too. And not everyone owns 3 BKs and a high end marine supply shop.
Those heads are critical in those #s. Gee, they're probably $4000/set.
And I think JC's customer already had those SCs on them.
Sometimes you just gotta make due.
Those heads are critical in those #s. Gee, they're probably $4000/set.
And I think JC's customer already had those SCs on them.
Sometimes you just gotta make due.
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Re: why r mer's engs making more hp that jc's @
a milder cam with the same combination would have still made respectable power at 6000 & made a big improvement
in midrange torque. big inch motors don't have a good history
of survival at 6800 rpms.
in midrange torque. big inch motors don't have a good history
of survival at 6800 rpms.
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Re: why r mer's engs making more hp that jc's @
too old i was trying to understand why your motors which i have seen at mers shop, using those huge port profiler heads would be more of a high rpm power maker. when i saw the dyno #'s from your 2nd engine and WHERE your motors made all that power amazed me. then i looked @ jc'syno sheet and his motors make hp at a lot higher rpm with smaller heads and blowers which didn't make sense to me. i know what cams your running in your motors as marks putting the same ones in mine and there is nothing mild about them yet the motors make massive hp at a really resonable rpm level which should make them last. BTW why will your baot actually have them motors in it? what is the first poker run you plan to attend this year? your ride is looking sweeter all the time. ratman
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Re: why r mer's engs making more hp that jc's @
Ratman what cam are you running?
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Re: why r mer's engs making more hp that jc's @
caveman told mark @ mer i wouldn't disclose cams specs as part of eng build. it is a solid roller with a lot of lift and duration, and as you can see on too olds motors makes an azz load of hp and torque down low. mine motors are the next project on marks @ mers to do list.
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Re: why r mer's engs making more hp that jc's @
I have installed both j.c's and mark's engines in my client's boats. first off I would tip my hat to both. two talented individual's. secondly my client's have pounded fire out of both their engines with out any catastrophic failure, so either way keep up the good work guy's.
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Re: why r mer's engs making more hp that jc's @
Originally Posted by ratman
why do mers motors make so much more hp and....
RumRunner, What is an "RFE" head?
Just a friendly reminder that many of you guys use names, and abreviations that the user seems to assume that everyone else knows what, and whom they are speaking of.