Want more sound(Holman Moody 302) |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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Posted: October-02-2008 at 6:47pm |
You dont need no stinking flappers, your exhaust isnt really underwater. I mean if you catch water over the back when you slow down you could consider it but I wouldnt worry about them too much. I think 3 inch would be how I would go with a 302 3 inch is plenty loud. I am concerned that for optimum sound your manifolds might neck down too far, I would compare your turn downs to some of the other ones shown in the diaries maybe there were different ones, if yours are really smaller its going to knock down the noise a bit.
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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I think I am going to go with 4". Do yall think this will look pretty good or will they look to big? The ones I am looking at are from Eddie Marine
and should I get with internal flappers or without |
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Chopper
Gold Member Joined: June-15-2006 Location: Australia Status: Offline Points: 821 |
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How about some nice over transom pipes
That should pick up the dB level a tad. |
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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1980 Ski Nautique
1966 Barracuda |
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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Is there anybody else that would sell quality polished stainless thru hulls and might have 3.5", I dont believe I need to go to 4" haha
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quinner
Grand Poobah Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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Roger Roger,
Wondering if in an I/O setup the motor itself moves at all when revved or loaded, there would not be much or any give on a rigid exhaust in such a tight area, if movement did occur I would imagine it would be transferred down the exhaust system and then to the hull. |
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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Yea that is what I was thinking and I think that is what reid was saying earlier also.
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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I think that he was referring to running a fabricated pipe (Stainless like Tims) from the thru hull to just below the manifold. Then you would use a short rubber hose section between the manifold to the pipe.
The pipe would be welding to the thru hull and the bends would allow you to install the fabricated pipe and thru hull as a single unit. That would be my guess.. |
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1980 Ski Nautique
1966 Barracuda |
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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Thanks for the compliments Chris. You have a very nice boat also. I called Holman Moody a long time ago and gave them the numbers on my motor and I think they told me it was rated at 225 but I am not 100% sure, its somewhere around there. She runs really good though, although I am not exactly sure what a accurate speed would be. My buddy had a old Master Craft with a 351 in it out on the lake a while back and I outrun him haha.
what exactly do you mean by a rigid setup? |
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jbear
Grand Poobah Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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Not to worry Roger...I figured you would find this e-mail sooner or later!
john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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Sorry I missed this John. Yep, I have an Acme 540 now. Made a huge difference... and not just stopping the vibration. And you are correct, Reid is a pretty handy guy to know.... lots of good info there. And a really great guy. |
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1980 Ski Nautique
1966 Barracuda |
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quinner
Grand Poobah Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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That's got to be one of the badest Tri-Hulls I have ever seen. What is that 302 rated at for HP, 210? That boat must really move, what do you guy's think the top end would be?
Also, would a rigid Exhaust connection be OK in that setup? Cool Boat Ryan! |
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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Keep making that thru hull bigger and before long you will be able to use chainsaw to cut it..
EDIT: I have got a couple 5lb coffee cans in the kitchen that I can let go cheap. A chainsaw and a little 5200 and you will be set. |
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1980 Ski Nautique
1966 Barracuda |
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reidp
Platinum Member Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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The HM exh dia is 3" O.D. for the main portion of the outlet, with a small lip around the end the goes to like 3.2" but does go around a 3" pipe.
EDIT: And I guess I wasn't paying attetion to what you saw Roger as it does say "cast bronze" and not chrome. Well Ryan, you may have to go to 4", and I'll hear you up on Hwy 421. |
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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I see that what you are talking about Roger. I didnt notice the n/a before
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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Reid, I looked at that site you provided and noticed that the 3 1/2 were listed with a Part number of "n/a" for the SS. It did not provide a part number for chromed Bronze. |
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1980 Ski Nautique
1966 Barracuda |
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reidp
Platinum Member Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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Roger, the bronze ones I've seen are typically chrome plated, so that look great as well, but then you'd have a bigger issue welding if need be.
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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Wow, thats some nice exhaust tim has there. Yea I was just curious as to price but I definately want some 3.5" polished, I sent them a email to get some info on the 3.5" ones. What is the diameter of the ends of my exhaust manifolds?
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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Ryan,
Cheapest I can find those thru-hulls is $81.20. 3" Thru Hulls That is the 3in because the 3 1/2in are only listed in Bronze. Not sure bronze would look good. |
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1980 Ski Nautique
1966 Barracuda |
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reidp
Platinum Member Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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Yep, Gary. Looks like he's gonna needs Tim's fabricator too.
Ryan, I can't remember the exact cost of the thru-hulls, but I believe mine were in the $50-60 range each, and the 3-1/2's could be a little more. But don't settle of cheap imitations as these will look sculpted just like your originals. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Reid, look at the 1st and 2nd pic's.I don't know if it's an optical illusion, but it dosen't look like the thru hulls are straight back from the manifolds either,complicating matters more
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reidp
Platinum Member Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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In terms of the smaller pieces, that's exactly what I was talking about.
As for Tim's set-up I should have been more specific as he has a plethora of CC's here. http://correctcraftfan.com/forum/forum_posts.asp?TID=6888 |
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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How would I find that setup you just mentioned?
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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If I use some 3.5" pre bent house then I can probably use smaller pieces of hose to put around my manifold and then just put my 3.5" piece over those and then tighten her down? I think thats what you were saying right
Do you remember how much those thru hulls were?..polished stainless |
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reidp
Platinum Member Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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Wow. Looking back at the pict showing the flex hose in the radias, it might be better to at least look at welding a SS radius to the inside of the thru-hull. It'd have to be such that the radius would fit thru the transom hole of course. You could end up with a slick mini-version of Tim's SS exh. Look that up if you haven't seen it already Ryan.
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reidp
Platinum Member Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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Crusader engines from the very early 70's like TRBenj (Tim's)with log manifolds used a 2-1/2" outlet on the exh's but used a short "sleeve?" of 2-1/2" hose around the exh outlet and then put the 3" full-length hose over that. That was the simple spacer type deal I was refering to above. It would be best to see if you can't find some pre-bent rubber hoses in the 3-1/2" dia as the exh hose will be hard to bend that tight. You may have to find some tight radias pipe in stainless, fiberglass or some other material and just use some very short pieces of rubber hose to make the connections, as you don't appear to have much horizontal distance to work with.
Tim, sorry we missed your initial revelation. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Ryan I don't think you could make that sharp bend with smooth hose maybe someone will have an idea-
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HM302
Newbie Joined: September-30-2008 Location: United States Status: Offline Points: 21 |
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Yall know your stuff, I just measured my exhaust outlets and they are only 2 3/8". Those thru-hulls are nice reid. I think I want me some 3.5" ones. What would I need spacer wise like you were talking about? I kinda would like to get new rubber hoses on both ends that are more smoother instead of the ones with ridges.
Yea I plan on cleaning them up and doing some other odds and ends to her over the winter, I guess I have been to caught up with having so much fun driving her around on the lake all the time. |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21109 |
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Geez guys, didnt I already say that? Just busting your balls- Im positive that particular tidbit originally came from a conversation I had with Mr. P. Id be curious to hear how that Dixie runs out... and definitely clean up those valve covers! |
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reidp
Platinum Member Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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Good eye Joe!! A 3" or 3-1/2" O.D. on those thru hulls would certainly make it talk out loud. Ryan, you'd need a spacer of some sort around the end of the manifold (thin strip of 3" hose), but then you could go with the 3-1/2" thru-hulls for extra noise. I bought a set of these (3") and they are NICE!! http://www.buckalgonquin.com/pages/ProductPages/exhaust/tran_exh_stra_page.html I know converting a Correct Craft from the smaller 2-1/2" thru-hulls found on many pre-70's boats to a 3" system definitely adds to the sound. FYI, most CC's with small block Interceptors, Grays, and pre '67-'68 Chryslers (poly 318's) used the smaller exhaust pipes. The HM's and later small block Chryslers all had 3" exh manifolds which dictated the hose and thru-hull size and that became the norm. Most big blocks were 3" I believe. Oh, and Ryan, I love those valve covers. But you've got to clean them up! |
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