SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: onetool1 on May 22, 2009, 01:45:47 PM
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Hello all,
I am really stoked to have found this site.
I have recently bought a spectra 18. I got it without a motor. This is my first boat and being I had a motor sitting in the garage out of a truck I thought put the motor in it and ROCK N ROLL!!!
Well after cruising through the forum for a while I find this isn't a good idea. My purpose for this boat is to cruise around with the family and some tubing. So I am looking for some pointers on building a good reliable motor without breaking the bank. At least until i get my feet wet.
At the current time I have the motor tore down ready to go to the machine shop Tuesday.
Thank you for your time
Randy
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Welcome to SCJB. I'm kinda doing the same thing myself building a stock 468. Keep us posted with some pics of the boat and progress.
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Welcome!, And BTW, pics are a pre-requisite.
That being said, nothing wrong with dropping the motor in and running it, assuming it ran good before. Then do your hot rodding next winter. We're into season now, dude, drop it in and see what happens! That's kinda the way these boats started anyway, using street engines and they ran just fine.
Ray
Now you gotta throw it back together!
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Alot(obviously) has to do with your budget. What cyl. heads are you working with. If the #'s end in 049 or 781 you have a decent set of ovals. If they end in 990 you hit the jackpot.lol
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Thanks Ray
That eases things a bit.
I have looked up the casting numbers on the heads they are said to be "peanut" heads. Which I am told don't flow very well.
The budget is pretty tight and another of my concerns are that I don't want to be unsafe about it.
Is it really needed to have a marine alternator/ carb / fuel pump in an open engine bay?
are hyper pistons ok in a cruiser setting?
Here she is
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.acme13.com%2FIMG_0596.jpg&hash=b6ba6a1e018feff3ae75833a3bbfd298913132f8)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.acme13.com%2FIMG_0597.jpg&hash=5efeb206fbd968c8b3054eb3cbfa6730f12f8ac0)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.acme13.com%2FIMG_0602.jpg&hash=e4a2f02b9245810c1798de2faf9779bbc0d38f0f)
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On the alt. carb. and pump, It boils down to legal or not(imo). On the hypers...make sure your machinist, knows what he's doing. Some pistons(metals) expand more than others.
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nice boat, i saw that boat on craigs list a few weeks ago and i wanted to buy the seats, looks good. here is mine
The Beav
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A budget build on a BBC is really tough. I'm in the process of going through the 454 from my Hondo. What I found when I opened it up was a bone stock (std bore/std crank) engine that was just worn out. Luckily I had a good set of 049 head to start with and a near new Comp Cam that I retained. Other than that I'm gonna be at about $3000 with new parts and machine work (I'll do the assembly).
Parts = forged pistons Machine work = clean everything
rings bore & hone with deck plate
oil pump machine crank 10/10
bearings recon rods with new bolts
rod bolts chamfer crank
head bolts balance everything
timing kit surface heads and grind valves
valve springs
retainers & keepers
lifters
rocker studs
roller rockers
gaskets
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$3500 is right were i was at in my 454 for all new parts and machine work. just break out another thousand....lol (b.o.a.t.)
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Pretty much the thruth! lol. Loaned my boat to OC2, I think it's gonna cost me $500 for parts to get it back, lol. Those poor guys had nothing but trouble with a boat I thought was running fine, lol! (You guys will hear the story eventually)
'tis all good though, they found a bunch of what Jeremy calls "gremlins" that woulda haunted me instead anyway. Thanks to Jeremy, Nordie, and Terry for doing it all! You guys are TITS!
As far as an engine rebuild, can be done much cheaper if rods, pistons, cam, crank, etc can be saved and reused. You don't need to go forged pistons (Though Crewcheif, Brad and I all feel that we should, but we're hot rodders.)
You can buy rebuild kits all day long for under $400, and I say do that, have the engine hot tanked since you have it apart, have the heads checked, hone and deck the block, polish the crank, put it back together and go. You can hot rod it later. And can get it done for about a grand total since it's a BBC. It's nearly June dude, let's just get it in the water!
Ray
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are hyper pistons ok in a cruiser setting?
Yes they are just fine when installed with the proper clearances. Running an engine that came out of a truck may or may not work because a truck engine has different clearance specs than a marine engine. If I was you I would build the engine the right way once and not be stuck out on the river or lake waiting for a tow back to the launch. I tried the old junk yard engine and it didnt work out for me. The top ring on the pistons was not gapped for marine use and popped the lands off of 3 or 4 forged pistons. Good luck with whatever plan you choose.
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Thanks Ray
That eases things a bit.
I have looked up the casting numbers on the heads they are said to be "peanut" heads. Which I am told don't flow very well.
The budget is pretty tight and another of my concerns are that I don't want to be unsafe about it.
Is it really needed to have a marine alternator/ carb / fuel pump in an open engine bay?
are hyper pistons ok in a cruiser setting?
Here she is
Your "peanut" heads are fine use em............ they make lots of torque
Alt/carb/Fuel pump... Covered engine bay , need to be marine!!
If open engine bay, automotive is just fine......
As Ryan said earlier, Hypers are fine. run good gas and get your timing right and forget about it..