SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: RedSnapperSlapper on March 29, 2011, 10:25:16 PM
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I took the boat out this last weekend to parker for the first run on the new motor. I got this motor from a family friend its a 454 BBC that cam out of a motorhome that had less than 500 miles on it. I think I have a stuck lifter or something is wrong in the valve train, so the motor is coming out this weekend. i thought while I have it out i would change the cam. anyone have any ideas or suggestions on a particular cam to use?
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I took the boat out this last weekend to parker for the first run on the new motor. I got this motor from a family friend its a 454 BBC that cam out of a motorhome that had less than 500 miles on it. I think I have a stuck lifter or something is wrong in the valve train, so the motor is coming out this weekend. i thought while I have it out i would change the cam. anyone have any ideas or suggestions on a particular cam to use?
Probably a collapsed lifter, not stuck, maybe even a spit push rod (more common than you think).. ;)
IMHO if you have the resources I would try to go hydraulic roller, if not, I have had pretty good success with the XM Marine cams from Comp, I have a new in the box cam and matched springs and lifters I could sell if interested... :-\
I have this puppy... http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=11-240-4&Category_Code=MARKIVCAMHFTXM (http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=11-240-4&Category_Code=MARKIVCAMHFTXM)
I bought the whole package a while back and only used the timing set...And yes, I'm F-n retarded... :screwy:
GT
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Chevy has, had lifter bore issues, take a small brake hone and clean them up. The lifter needs to be able to rotate, even if you find something else it would be preventive maintance to do so.
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Thanks for the info. I am bringing the boat to my shop on friday to pull the motor i have some work to do on the pump as well. GT what cam would you suggest if i went hydrolic roller? my buddys friend owns a speed shop might be able to get a hook up. Also let me know how much you are asking for the cam and lifter sed you got?
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X2 on the extreme marine cams from comp.
XM298H Pulled a Jacuzzi 'B' to 5500 (similar to a berk 'A' )
What heads? intake? C.R. ratio? Exhaust?
Daniel
Mash on it
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To be honest I have no idea. :o I pick the motor up from a family friend and threw it in the boat and went for it. All i did to it was put new lifters pushrods and gasket kit on this thing. The motor came out of a motorhome. I am assuming the thing is real close to stock minus a cam maybe.
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Post up some Casting #'s when you get it. stock heads, springs are limited on lift (.475"?) maybe less?
Daniel
Mash on it
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I'll try to get some numbers off it toninght. right now i am running a 750 holly with an aluminum intake manifold not sure what model or make and hooker through transome headers. Thanks for the help
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Thanks for the info. I am bringing the boat to my shop on friday to pull the motor i have some work to do on the pump as well. GT what cam would you suggest if i went hydrolic roller? my buddys friend owns a speed shop might be able to get a hook up. Also let me know how much you are asking for the cam and lifter sed you got?
Send me 25 crisp $100 bills and I will send you enough crap to build an entire boat with a fresh 454 and a Berkeley pump.... :sly: ;D
I will find out and let you know tonight.... :thumbup:
GT
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Shit that would be nice. I was thinking about switching out the jacuzzi for a berk while i had it out. found a complete rebuilt berk with a impellar for $500
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Not sure if thats a good price. just an idea my brother and i were kikin around
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The biggest problem with stock BBchevys is that the valve guide is tall and won't allow much of an incerase in lift, may be only to .490. You need to check it by having some one measure from the top of the retainer to the head, then while you compress the spring until it hits the top of the guide and remeasure, subtract .060 and thats all of the lift you can have without machining the guides down. Do both the intake and exhaust the amount of clearance will probably be different. Your big problem is the cast hypereuctetic pistons, even the trucks have them. They will explode at about 400-450 HP, or with ANY detonation. Intake and carb- you can usually get away with, cam usually explodes the Hypereuctetic pistons. Even the stock 330 HP boat motors have the junk pistons too. Also a car or truck ignition curve is way different than a jetboat wants, it not only limits the available horsepower, but kills the fuel mileage too. Good luck. TIMINATOR
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Shit that would be nice. I was thinking about switching out the jacuzzi for a berk while i had it out. found a complete rebuilt berk with a impellar for $500
No, you misunderstand.......Hull, trailer, interior, motor, pump, ignition, controls......The whole enchilada... :thumbup:
GT
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GT what type of hull? full stringer? got any pics
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pulled the motor tonight. time for the fun to start and see whats up with this thing
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O0
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GT what type of hull? full stringer? got any pics
19' Bradhaul (White Trash I), full Mahogany stringered semi light lay up no false floor, no rotten wood, tandem trailer with aluminum diamond plate trim, metallic blue............You would look killer in this boat. ;)
I have two fiberglass buckets, a bench rear seat and enough stuff to get it ready for the water, for the most part.... :sly:
I will try to get some pictures this weekend, it is 83* outside right now..... :thumbup: :thumbup:
GT
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GT
what does the hull look like? i tried looking it up on line and couldn't find anything. does it have a rub rail or is it all finishedand glassed. Does it have a rail kit, gas tanks?
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GT
what does the hull look like? i tried looking it up on line and couldn't find anything. does it have a rub rail or is it all finishedand glassed. Does it have a rail kit, gas tanks?
Skinny rubrail, no rail kit, but four point mounts, this boat is a one off type deal...
Here are some teasers until I get home in the daylight.... :banghead:
[attachimg=1]
[attachimg=2]
[attachimg=3]
Get back to you when I can.... :thumbup:
GT
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I just pulled the intake and valve covers off the motor and sure enough a flat lobe on #6 exhaust. Don't know what happened but its the only one thats chewed up :banghead:.
GT. Did you think about a price for the Comp XM cam and lifter set you got?
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boat looks nice. are those tanks fiberglass like the spectra ones?
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Skinny rubrail, no rail kit, but four point mounts, this boat is a one off type deal...
Here are some teasers until I get home in the daylight.... :banghead:
(Attachment Link)
Get back to you when I can.... :thumbup:
GT
Your place looks as crowded as mine!
Honestly,though, if you'da backed your truck up a little in this pic, woulda looked like a blast from the past pic of the boat when it was new! What's up with the neighbors? Do they own a vehicle from this century? Havent seen a Citation or Celebrity wagon in many years! ;)
Ray
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GT,
That sure is a nice looking boat.
That hull resembles my 77GT.
Can you take some side views of the bubble and an end shot of the transome.
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I also run the Comp Cam marine cam that is set up for a berk.... And it is AWESOME! Sounds great too at idle. I manage to idle at about 750 with it and doesn't die. I switched over to full roller motor when i did a rebuild and it was worth it.