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Old 17 July 2007, 10:42   #21
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same Moda

cuzz it's best to be Ready at All times

for Any thing that mite come around the ben
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Old 17 July 2007, 19:49   #22
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Fred that motor is gorgeous! What was it originally? Looks like a modded Stinger from the pics?

Have you done any work with pressure waves and expansion chambers on dry exhausts? I wondered about trying it on one of my old mercs but decided it wasn't really worth the hassle to mod a 50 Blueband. Too much work to play with a blind bore.
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Old 17 July 2007, 20:56   #23
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70hp cases are easier to come by, but for the most part STINGER.
the reflection wave is vary important, the in line triple works the wave the best,
cuzz when one cyl is closein one is exhaustin witch forces fresh fuel and air mix that has passed out of the cyl that is closein back in. with the right length tuna
you can get maximum affect. if you separated them with 3 expandos it would lose hp.

them blind bores, they do go, but they run out of port timin early and fall off fast on the power curve at the top.
this Moda peaks at 6700rpms, at 8000rpms she has lost 1 3/4 hp from peak.
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Old 17 July 2007, 20:58   #24
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Quote:
Fred that motor is gorgeous!
thanks
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Old 18 July 2007, 06:13   #25
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Quote:
Originally Posted by fast fred View Post
cuzz when one cyl is closein one is exhaustin witch forces fresh fuel and air mix that has passed out of the cyl that is closein back in. with the right length tuna
you can get maximum affect. if you separated them with 3 expandos it would lose hp.

Can you not get the same effect using a 3:1 spanny or would you get a drop-off of torque at low RPM and get a 'powerband' effect like a 2 stroke bike engine?

I guess a 3:1 spanny wouldn't be the easiest thing to make properly though-even the Japs couldn't do it very well on the production bikes that used them. They always went better with 3 spannys.
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Old 21 July 2007, 05:54   #26
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it gets the same effect as a 3 in to one. the demand on the water are vary dif ' than on land, as small as my hull is, it will never see the rpm range my triple street bikes did. on land the wave don't start workin till like 8000, at 8 on the water she is startin to over wind, hp is startin to fall off.
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Old 21 July 2007, 06:01   #27
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the one on the right i built for a friends drag boat, mine's the dusty one on the left.book ends
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Old 22 July 2007, 06:50   #28
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Quote:
Originally Posted by fast fred View Post
same Moda

cuzz it's best to be Ready at All times

for Any thing that mite come around the ben
you might need to explain to some folks out there what your little purple connector does.....
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Old 23 July 2007, 08:18   #29
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well them thare is Nitrous Oxide injectors, only one in the shot, but with 3, located after the reed blocks to eliminate any chance of the reeds freezin, they WILL Double the HP output when ya hit the switch. by injectin NOS and Alcohol
into the race gas Moda.
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Old 23 July 2007, 11:34   #30
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HEy Fred, how many horses do you think it's possible to get out of an 85 Yam and still keep it reliable?
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