Shorty Headers melting engine mounts?!

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scottyroll
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Shorty Headers melting engine mounts?!

Post by scottyroll » Wed Aug 28, 2013 3:33 pm

I put on some stainless shorty block hugger style headers I got online on my build the other day and immediately noticed that the collector is really dang close to the engine mounts with poly bushings especially on one side where the engine mount nut might very well be touching the header. I know headers get hot; and heat is bad for anything :? Does anybody else run this style header ? Will it be safe to run? let me know what yall think !
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1999 14ft Alumitech deckover. ZZ502. 2.37 Stinger. 4 blade WW Falcon Prop

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Re: Shorty Headers melting engine mounts?!

Post by Fabian9748 » Wed Aug 28, 2013 3:43 pm

i wouldnt run them, it would be bad if yu ended melting your bushings. also not a fan of how the exhaust looks once hooked up to those headers, id call alumitechand order a set from them. they have some good prices on headers

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Re: Shorty Headers melting engine mounts?!

Post by cuncrt » Wed Aug 28, 2013 3:44 pm

mine are about 3" away and i havent noticed any melting with 150+ hours.
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JAMES
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Re: Shorty Headers melting engine mounts?!

Post by JAMES » Wed Aug 28, 2013 3:49 pm

not airboat friendly long tubes are great or reg style .. i may no where a newer set of ss headers are ss long tubes if interested
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FlatsFisher
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Re: Shorty Headers melting engine mounts?!

Post by FlatsFisher » Wed Aug 28, 2013 6:55 pm

I replaced the bushings in my boat a few weeks back, and didn't notice that the heat had any effect. They looked to be about 10 yr old aircraft bushings.

IMO...run em.

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Re: Shorty Headers melting engine mounts?!

Post by glades cat » Wed Aug 28, 2013 9:56 pm

Might try some exhaust wrap to contain the heat. Gasses also flow better when hot.
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Re: Shorty Headers melting engine mounts?!

Post by gyrocopter582 » Wed Aug 28, 2013 9:56 pm

Make a heat shield out of stainless, or aluminum.
Problem solved. :dontknow:
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Re: Shorty Headers melting engine mounts?!

Post by gyrocopter582 » Wed Aug 28, 2013 9:58 pm

Ooh, Glades is right too... he usually is.
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Re: Shorty Headers melting engine mounts?!

Post by Dixiedog60 » Thu Aug 29, 2013 9:20 am

Scotty I have some stainless sheet you can have to make a shield but it looks like its hitting that bolt before you add the flex and band clamp make sure its not touching or it will transfer heat right up that bolt. PM me if you need the metal.
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Re: Shorty Headers melting engine mounts?!

Post by glades cat » Thu Aug 29, 2013 9:28 am

Just a thought...
Have you tried swapping them around. Usually, they have a slight off-set and it may be just enough.
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Re: Shorty Headers melting engine mounts?!

Post by scottyroll » Thu Aug 29, 2013 11:37 am

James- Thanks for the heads up..these huggers might be too much hassle to work with and I may need to consider swapping them out with some real airboat headers. I'll PM you if I bail on these but of course I don't want to take a loss on headers I already have.

Dixiedog- Thank you for your offer..I will def let you know if I decide I need the metal to fix this! And let me know if you ever need an extra hand working on your fine boat :usa:

GladesCat- Yes, I went and swapped them around last night and got a little bit better results. One side is free and clear and should be fine with a little shielding. But after putting a soft mallet to the side of the other header group I was only able to free it up about a 1/4 off the bolt..SO there is no contact but it is Still too close for comfort on that side. Perhaps I could bend them out better with a torch or maybe let the engine get hot and put a prybar to the side of the header to pull it out and away from engine mount?

I'm going to take a short break and take my bicycle out for a while and try to clear my mind. When I get back I plan on researching the heat ranges poly will survive and sbc exhaust temperatures. This boat has been a fun project for me I enjoy learning and turning the wrenches but this "iffy" stuff is no fun.
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Re: Shorty Headers melting engine mounts?!

Post by JAMES » Thu Aug 29, 2013 5:53 pm

U COULD FLIP THEM LIKE AN UPSTACK IF IT WILL ALLOW THEN U B IN BUSINESS
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Re: Shorty Headers melting engine mounts?!

Post by scottyroll » Thu Aug 29, 2013 8:40 pm

JAMES wrote:U COULD FLIP THEM LIKE AN UPSTACK IF IT WILL ALLOW THEN U B IN BUSINESS
Yeah I briefly did that mock up as well when I pulled the headers off earlier and if I can get the dipstick out of my way then I might very well go that route for the time being. I gotta check for valve cover and carburetor access and also see if some bent exhaust tubing would be practical because I still want the exhaust to exit down and out the stern. It would def look a little bit strange but as long as it doesn't interfere too much with the other engine components I'll prolly do it. I'll try and post a pic of that setup tomorrow!
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Re: Shorty Headers melting engine mounts?!

Post by scottyroll » Fri Aug 30, 2013 12:18 pm

Alright guys, I took the headers off again and mounted them up-stack style. I had to bend my dip stick tube towards the block but I think I got it just fine with no breakage or other real issues. valve covers are still accessible with plenty of room for carb. At the moment I really like them up like that but now (Cause I'm imagining turbo's on top of the headers :lol: ) I need to figure out how to do the exhaust if I decide to keep it like this. I'll probably swing by a muffler shop and see what they can do cause I would like each of the exhaust pipes to join under the engine and out of the way of other things and exit thru one flex exhaust tube somewhere. Or maybe go up and over the cage?
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Re: Shorty Headers melting engine mounts?!

Post by JAMES » Fri Aug 30, 2013 9:09 pm

scottyroll wrote:Alright guys, I took the headers off again and mounted them up-stack style. I had to bend my dip stick tube towards the block but I think I got it just fine with no breakage or other real issues. valve covers are still accessible with plenty of room for carb. At the moment I really like them up like that but now (Cause I'm imagining turbo's on top of the headers :lol: ) I need to figure out how to do the exhaust if I decide to keep it like this. I'll probably swing by a muffler shop and see what they can do cause I would like each of the exhaust pipes to join under the engine and out of the way of other things and exit thru one flex exhaust tube somewhere. Or maybe go up and over the cage?
DAMN IT WORKED LOOKS GREAT PLENTY OF CLEARANCE U WANNA GET CREATIVE ILL TELL U ANOTHER WAY TO SAVE $$$ JUST ADD SMALL MUFFLERS OR CONES AND BE DONE NO FLEX NEEDED
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Re: Shorty Headers melting engine mounts?!

Post by Cowboy Rock » Fri Aug 30, 2013 11:34 pm

I like it,,, Reminds me of my old Pulling truck... Put Cherry bombs on top with flappers,,, lol

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Re: Shorty Headers melting engine mounts?!

Post by southbound125 » Sat Aug 31, 2013 7:40 pm

hey scottyroll, maybe you could cut a 1/2" pie wedge from the top and bend the headers out, then tig um!
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Re: Shorty Headers melting engine mounts?!

Post by darrell » Sat Aug 31, 2013 10:10 pm

that looks pretty bad a$$ just run the exhaust up to the top of the cage or you could put twin turbos on it and really be bad a$$
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Re: Shorty Headers melting engine mounts?!

Post by mad_mike » Sat Aug 31, 2013 10:21 pm

Upward thinking on mounting those headers. Do you have room to bring the pipes forward then down and out the back or are you thinking of running them high? Seems like supporting the pipes up high may be a challenge?

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Re: Shorty Headers melting engine mounts?!

Post by :) » Sat Aug 31, 2013 10:34 pm

Scotty, i like it.. id think about JAMES idea. Just put small muffler or cones on top and be done. No exhaust to rot out and replace and it looks really cool. Have to put a flapper on top like a semi to keep rain out but that would be easy.
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Re: Shorty Headers melting engine mounts?!

Post by :) » Sat Aug 31, 2013 10:35 pm

Cones and some 45° elbows to direct the noise off the person in the back seat.
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Re: Shorty Headers melting engine mounts?!

Post by scottyroll » Tue Sep 03, 2013 5:03 pm

Thank you all for your input. It took me 3 days to get back to jax from my buddys bachelor party in tampa (even though he called off the wedding we still went lol) I guess the upstacks are here to stay at least for the first few test runs!
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