Too much RPM?
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Too much RPM?

  1. #1
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    Default Too much RPM?

    I just put together a 17 foot weimans (no hook) with a 383 small block .040 over, brodix track1 heads, HV1000 intake, solid roller, hp 950 holley, with a Berk 12ja, Aluminum B impeller fresh from JBP. The boat ran 68mph on gps with 20 gallons of fuel and 400 lbs of passenger load, max rpm is 5300. I have no dyno time on this motor so I'm not sure where peak power is. Can the aluminum impeller handle that kind of rpm or power for long? Also, I have not messed with jetting or timing, so there's potential for more power...

    Thanks for any input

    Ross

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    Senior Member chevy's Avatar
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    Not an expert on this [DISCLAIMER] but my guess would be that 383 is prob. putting out about 375 to 475 hp maybe more if you left a few things out on your post. An aluminum impeller should be ok unless the pump is unloading and reloading under heavy throttle. The main reason your hauling a$$ is you have one of the best made and fasted hulled boats out there

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by 69weimans View Post
    I just put together a 17 foot weimans (no hook) with a 383 small block .040 over, brodix track1 heads, HV1000 intake, solid roller, hp 950 holley, with a Berk 12ja, Aluminum B impeller fresh from JBP. The boat ran 68mph on gps with 20 gallons of fuel and 400 lbs of passenger load, max rpm is 5300. I have no dyno time on this motor so I'm not sure where peak power is. Can the aluminum impeller handle that kind of rpm or power for long? Also, I have not messed with jetting or timing, so there's potential for more power...

    Thanks for any input

    Ross
    Ross , Congratulations your "in the water" your initial "numbers" sound pretty respectable ! Its not unrealistic to think your Combination is making a smidge over 400 hp , although you kind of on the edge the aluminum impeller should be OK like Chevy said "keep it in the water" Tom


    H.P. 9.5 9.25 AA A B C
    150 2900 3050 3200 3600 3800 4050
    200 3200 3350 3500 4000 4200 4450
    250 3450 3600 3700 4300 4500 4800
    300 3800 3950 4050 4550 4800 5100
    350 4050 4200 4300 4750 5100 5350
    400 4250 4400 4500 5050 5300 5600
    450 4450 4600 4700 5250 5500 5850
    500 4650 4800 4950 5400 5700 6050
    550 4800 4950 5100 5550 5850 N/A
    *THESE RPM VALUES MAY VARY ACCORDING TO HOW YOUR BOAT ALLOWS THE PUMP TO LOAD
    HORSE POWER REQUIREMENTS ARE AT THE PUMP SHAFT

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    Senior Member Delemorte's Avatar
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    i dont think ive ever heard any one complain about too many RPM's... wish i had that issues...
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    Thanks for the replies fellas. This thing is so much fun. Now i need to try and get it over 70.... Oh and baffles are in order too. My ears are still ringing!

    Build pics soon to follow

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    Senior Member old rigger's Avatar
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    Is this the same '69 Weiman that was for sale on craigslist in Sun City? That's an impressive speed for the old deep entry Weiman, with a sbc. That hull is totally different than the Rogers bottom which I think chevy is thinking of. It's a streched Tahiti bottom, in fact back in the day Mr. Weimans hulls were built across the street from his shop at Tahiti. He had no glass shop.

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    Senior Member CK7684's Avatar
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    Do you have a pic of your hull??

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    Senior Member jetboatperformance's Avatar
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    69weiman not sure if I told you about this but I recently sold my "barn stored 70' Weiman to some nice folks in Idaho who have 4 those Classic Wieman boats and are relatives of Mr Weiman as well Mine was a Diebold marinized 428 cu Ford with Berk Jet (had been stored for 15 years ) Tom
    Check the serial number




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    Click image for larger version. 

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    hope these pics help. There is no model name anywhere on the boat so any info would be great. My hull ID is 186. The insurance company made me fax a copy of the registration because they didnt believe me!

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    Tom, I remember seeing that boat on your site. Wish mine was that nice when i got it. This has been a fun project though. In fact, You did the pump and got me those sweet rewarders. Now i need some baffles...have any laying around?

    Ross

  13. #11
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    Quote Originally Posted by 69weimans View Post
    I just put together a 17 foot weimans (no hook) with a 383 small block .040 over, brodix track1 heads, HV1000 intake, solid roller, hp 950 holley, with a Berk 12ja, Aluminum B impeller fresh from JBP. The boat ran 68mph on gps with 20 gallons of fuel and 400 lbs of passenger load, max rpm is 5300. I have no dyno time on this motor so I'm not sure where peak power is. Can the aluminum impeller handle that kind of rpm or power for long? Also, I have not messed with jetting or timing, so there's potential for more power...

    Thanks for any input

    Ross
    Your B impeller should be ok.... The "B" cut has a larger exit to it in its cut down, thus carries less pressure load... The launch will be a pressure point on the vane yet I think your ok...

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