knocking?

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sflsurfrider

heres the sitch.... 14' whaler, 62t 701, single 44mm , stock pipe, 175 lbs psi riva head, concord 13.17 impeller. probably over 1000 lbs plus me and gas....... when i go anywhere between 3/4 and full throttle, i hear knocking/pinging sound after about 5 seconds that lasts until a few seconds of idle....... runs and rides kiler.....

my guess is too steep an impeller with too high a compression with alotta weight. = need less compressin or lower pitch impleller

any thoughts? (smartass comments welcome too)?
 
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Crab

Crab

thanks darin...noswad!
Location
Seattle
sflsurfrider said:
heres the sitch.... 14' whaler, 62t 701, single 44mm , stock pipe, 175 lbs psi riva head, concord 13.17 impeller. probably over 1000 lbs plus me and gas....... when i go anywhere between 3/4 and full throttle, i hear knocking/pinging sound after about 5 seconds that lasts until a few seconds of idle....... runs and rides kiler.....

my guess is too steep an impeller with too high a compression with alotta weight. = need less compressin or lower pitch impleller

any thoughts? (smartass comments welcome too)?
Click to expand...
Too much load, need better gas and lower pitch prop, stock head might help.
 
P

PancakePete

Guest
pull 701, drop in, small block 350 with strait headers, and upgrade pump to jet boat 200mm !

That'll move that beotch ! :smokin:

Or try taking old fuel out, and running a tank of 93 thru it !
 
yamaslut

yamaslut

kill it
Location
Daytona Beach, Florida
trunk monkey????

sflsurfrider said:
heres the sitch.... 14' whaler, 62t 701, single 44mm , stock pipe, 175 lbs psi riva head, concord 13.17 impeller. probably over 1000 lbs plus me and gas....... when i go anywhere between 3/4 and full throttle, i hear knocking/pinging sound after about 5 seconds that lasts until a few seconds of idle....... runs and rides kiler.....

my guess is too steep an impeller with too high a compression with alotta weight. = need less compressin or lower pitch impleller

any thoughts? (smartass comments welcome too)?
Click to expand...
 
S

sflsurfrider

jett, refoaming is out of the question.

rick, propping up will make the problem worse.

pete, both tanks were drained and filled with 93 octane gas mixed w/ yamalube @ 50:1

kennay, richening the hi adjustor only makes the rpms fall off at lower points in the throttle range, but it doesnt help the pinging.

scorn, good call. after speaking with wcf and impros, im going to try an 85mm nozzle. that seems like the easiest and most logical way to handle this (for starters).
 
waterfreak

waterfreak

I had a vision!
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sflsurfrider said:
jett, refoaming is out of the question.

rick, propping up will make the problem worse.

pete, both tanks were drained and filled with 93 octane gas mixed w/ yamalube @ 50:1

kennay, richening the hi adjustor only makes the rpms fall off at lower points in the throttle range, but it doesnt help the pinging.

scorn, good call. after speaking with wcf and impros, im going to try an 85mm nozzle. that seems like the easiest and most logical way to handle this (for starters).
Click to expand...

you welcome!! now you buying beer for the rest of the week:Banane35:
 
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