SoCal Jet Boats

Tech Talk => Projects => Topic started by: honda1 on February 05, 2010, 05:56:07 AM

Title: 89 hallit 20.5
Post by: honda1 on February 05, 2010, 05:56:07 AM: what kind of HP increase would i see with tth on this thing its run through the bravo one out drive right now
Title: Re: 89 hallit 20.5
Post by: Willow Wog on February 05, 2010, 06:02:15 AM: Thats a nice boat but is it the european model? gotta be wierd driving on the right lol
Title: Re: 89 hallit 20.5
Post by: honda1 on February 05, 2010, 06:15:15 AM: its not a jet :sly:
Title: Re: 89 hallit 20.5
Post by: fast fred on February 05, 2010, 08:35:34 AM: Just for reference its spelled H A L L E T T. Matt
Title: Re: 89 hallit 20.5
Post by: Willow Wog on February 05, 2010, 06:36:00 PM: Quote from: honda1 on February 05, 2010, 06:15:15 AM
its not a jet :sly:

Thanks bud I was being sarcastic. back to the hallet, nice boat bud. Im sure headers would help but enough to cut holes in that beautiful boat? btw lets see more pics of her.
Title: Re: 89 hallit 20.5
Post by: Ralph Brunt on February 05, 2010, 06:40:11 PM: now i dont know shit about the brovo 1 (gt would be your man)
verry nice boat ;)
Title: Re: 89 hallit 20.5
Post by: GT Jets on February 05, 2010, 08:06:58 PM: Quote from: honda1 on February 05, 2010, 05:56:07 AM
what kind of HP increase would i see with tth on this thing its run through the bravo one out drive right now

What motor and what exhaust?

On our 330 HP 454, we saw just under 15 HP on the propshaft dyno going from the thru hub to IMCO thru transoms, I would think headers should be good for a tad more...The biggest problem with thru transom headers if they are not water jacketed is the heat build up on a closed engine compartment, it can be somewhat parasitic to the air charge (too warm)...

GT
Title: Re: 89 hallit 20.5
Post by: IRRebel on February 05, 2010, 10:42:00 PM: Not to mention against every boat reg existing with an enclosed engine compartment. Custom water jacketed's (true headers) are gonna be the only alternative, and gonna cost somewhere close to what the boat would sell for today. (Rewarder WILL make them for ya).

I'd leave well enough alone, G. Maybe find a good deal on some center risers.

Ray
Title: Re: 89 hallit 20.5
Post by: honda1 on February 06, 2010, 05:47:16 AM: It is a stoke merc package 454 330 and has stoke risers ???
Title: Re: 89 hallit 20.5
Post by: Luckie Stiff on February 06, 2010, 07:37:31 AM: Jim Brock has a nice set of Drake center risers with down pipes and all, all pretty and polished and stuff.
I'm sure Tom could get you some tips & hoses for them.
Title: Re: 89 hallit 20.5
Post by: jet boat performance on February 06, 2010, 08:56:26 AM: Quote from: honda1 on February 05, 2010, 05:56:07 AM
what kind of HP increase would i see with tth on this thing its run through the bravo one out drive right now

Harry Nearly any significant increase in "breathing" will help that MC application . The thru hub deal is restrictive , Assuming you currently have a rear dump "y" pipe set up , you'll need some manifolds like the Drakes Skip mentioned , rizers, tail pipes,tips s bend and a block off for the "Y" current deal . You will also want to Improve the Upper end as well to compliment the exaust changes (improved intake and Carb) I suspect that motor has peanut port heads originally (somewhat restrictive as an NA as well) Tom

BTW most modern aftermarket Center rize set ups , eg Eddie, Rex ,Dana etc will support 700+ hp I chose Eddie myself
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi147.photobucket.com%2Falbums%2Fr319%2Fjetboatperformance%2FEliminator%2520V-drive%2FDSC00244.jpg&hash=feb720cea122385f7c058b3e6eef003b8394b08d)
Heres some Danas we use recently
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi147.photobucket.com%2Falbums%2Fr319%2Fjetboatperformance%2FMatt%2520E%2FMVC-599S.jpg&hash=33784ac736269b0fe4a42cbe57aafbf97b6836d4)
Title: Re: 89 hallit 20.5
Post by: honda1 on February 06, 2010, 06:49:22 PM: WOW thats PERDY there Tom ;D
Title: Re: 89 hallit 20.5
Post by: OC2Vegas on February 06, 2010, 07:41:44 PM: Quote from: honda1 on February 06, 2010, 06:49:22 PM
WOW thats PERDY there Tom ;D

Toms always got the nice Sh#t! :thumbup: