SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: NO MAD 454 on February 07, 2008, 10:57:44 AM

Title: imco thumper proformance exhaust headers on old school boat..????
Post by: NO MAD 454 on February 07, 2008, 10:57:44 AM: Hey gang..just the other day i purchased a pair of alum.waterjacketed headers that are like or are (imco thumpers)..this is something im going to reg up on my bbc / jet..i have ?? on the headers..(1) do they work on jet applilications..(2) how much water pressure do i need from the manifold/t valve..(3) since they are water jacketed.means water is not supposed to leak from ports..just asking..new to these types of headers..let me know if u have better knowledge of these.. thx NO MAD
Title: Re: imco thumper proformance exhaust headers on old school boat..????
Post by: LBsuperjet on February 07, 2008, 03:29:51 PM: hey, sick ass headers! thats my choice if i could afford some...in my opinion, (and dont take it seriously) that there isnt supposed to be a t valve maybe? they run wet at idle so i figured that the water is supposed to go straight from the motor right? thats what i thought...

Reid
Title: Re: imco thumper proformance exhaust headers on old school boat..????
Post by: jet boat performance on February 08, 2008, 07:19:55 AM: Those are a good choice and a good find ,no you dont run a T valve , your exit water simply passes thru the manifold ,riser and out into the lake (call if you need plumbing help) We sell alot or these (competitors) and have good sucess they are good alternative ($) to jacketed headers , Your current risers will limit you cam choices (duration @ 500 to some degree) the photo attached is my V-drive cruiser the EMI's are rated (tested) for 750+ hp Tom

btw there are Tail pipe /riser options available ,if neccesary RE system cost new ,you might be suprised I'm very happy with mine and have had ZERO problems and the run "cool" (I'm al little testy right now nursing a 3rd degree bicept header burn)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fi147.photobucket.com%2Falbums%2Fr319%2Fjetboatperformance%2FEliminator%2520V-drive%2FMVC-038S.jpg&hash=b2ad3f6bc041a1590f0b90b6006f3b16d8d021fe)
Title: Re: imco thumper proformance exhaust headers on old school boat..????
Post by: NO MAD 454 on February 08, 2008, 10:20:39 AM: so what your saying. is i can run direct from manifold water supply to headers w/or w/out restricting the water flow pressure supplied from the pump..i still need to split the water flow? ..hows about the gate valve from pump to mani could i eliminate that.. damon
Title: Re: imco thumper proformance exhaust headers on old school boat..????
Post by: UNDONE on February 08, 2008, 01:11:58 PM: Pretty sure you're gonna want to keep the gate valve to limit pressure coming into the block.

Hey Tom, the bends in the exhaust.... Any significant power loss seen with them? My friend has the IMCO's on his 502 but he's got nearly 90deg bends in the tubing exiting them. Seems to me it would cause some unnecessary turbulence, etc and ultimately a power loss? I'm going to his house tonight probably, I'll see if I can snag some pictures.
Title: Re: imco thumper proformance exhaust headers on old school boat..????
Post by: jet boat performance on February 09, 2008, 09:40:43 AM: Undone I have nothing to compare it too but the Edddie stats were enough for me (HP ratings etc) ' Damon the water simply flows out the intake "water out let" (no retrictions ,no valves, 0 ) T unimpeded to the Ex Mans you can run the "restictor" Gate valve if you like at your Jet I don't like them personally , All my boats run "cold" Tom

http://www.eddiemarine.com/techsupport/assets/emi_dyno502_5483_3.pdf
Title: Re: imco thumper proformance exhaust headers on old school boat..????
Post by: NO MAD 454 on February 09, 2008, 10:49:30 PM: hey.thx for the input..will have trial run by the 1st weekend of march, will contact you for more info..damon..
Title: Re: imco thumper proformance exhaust headers on old school boat..????
Post by: UNDONE on February 10, 2008, 05:48:02 PM: I'm not sure we're on the same page... I was referring to the "collectors" I guess would be the best term for them.