Distance between exhaust and fuel line?

ArVeeNiner · #1 11-01-2009, 09:51 PM

I'm finalizing my exhaust but the left side gets within 1/4" or so of the fuel line. I've ordered the Van's heat sheild but even with that in place, is this too close? Any ideas?

DanH · #2 11-02-2009, 06:39 AM

Kelly,
Too close. Not enough photos/angles to offer a concrete suggestion, but you can do better.

Ironflight · #3 11-02-2009, 07:25 AM

I'm with Dan - too close for my comfort. You should be able to tie the fuel line to the next higher engine mount tube...somehow!

N941WR · #4 11-02-2009, 07:33 AM

Ditto for me. I tried my best to get two inches between the fuel line and the exhaust and even then I added some heatshields clamped to the exhaust to protect the fuel line.

Remember, things move around a good bit in there. Some of it because of engine vibration and some because of the volumn and speed of the cooling air.

Fuel line gap (Before installing heat shields):

Heat shields:

Mel · #5 11-02-2009, 07:42 AM

I think you'll find it unanimous. Too close.

ArVeeNiner · #6 11-02-2009, 08:20 AM

Thanks for the input. Too close is what I was thinking as well. I'll play around with it tonight. Yesterday was the first time I had the last section of exhaust installed since routing the fuel line. I was surprised at just how close it ended up.

I have the fuel flow transducer in line just upstream from the carb. If I remember correctly, either it wants to be mounted horizontal and the carb inlet wants the line coming in horizontally or with a slight downwards slope. I have to check my paperwork when I get home. Does this sound correct?

Thanks again.

N941WR · #7 11-02-2009, 09:17 AM

Quote:

Originally Posted by ArVeeNiner

... If I remember correctly, either it wants to be mounted horizontal and the carb inlet wants the line coming in horizontally or with a slight downwards slope. I have to check my paperwork when I get home. Does this sound correct?

Thanks again.

Kelly,

The others will probably add something to this but what you don't want is your fuel lines to have any "pouches" in them. By that, I'm saying the fuel lines should be heading down hill all the time so there is no place to accumulate water or sediment.

One exception to that, the lines may run up hill from the gascolator and then down to the carb. Any water/sediment left in the line will run back to the gascolater, just make sure you don't go too high. In my case, the line runs out of the gascolater, up to the fuel flow meter, down to the fuel pump, and then down to carb.

ArVeeNiner · #8 11-02-2009, 09:24 AM

Quote:

Originally Posted by N941WR

Kelly,

The others will probably add something to this but what you don't want is your fuel lines to have any "pouches" in them. By that, I'm saying the fuel lines should be heading down hill all the time so there is no place to accumulate water or sediment.

One exception to that, the lines may run up hill from the gascolator and then down to the carb. Any water/sdiment left in the line will run back to the gascolater, just make sure you don't go too high. In my case, the line runs out of the gascolater, up to the fuel flow meter, down to the fuel pump, and then down to carb.

Ahhh, that makes perfect sense. Thanks!

whittfic · #9 11-03-2009, 12:57 AM

Sorry I am hijacking your thread here but you have highlighted a similar concern I have about the proximity of a fuel line/carb connector to the exhaust pipe on my RV6.

I have an 0-360 with a 4 into 2 exhaust system (no flexible joints) and as the photo shows, the carb fuel hose connecter is only about 1/4" from the exhaust pipe. Unlike Kelly's situation, the hose itself is directed well clear of the exhaust system, it is the connector that is worying me. I am hoping the collective wisdom of the forum can offer some insight, is this OK or should I be looking for some sort of 'low profile' connector?

http://i456.photobucket.com/albums/q...c/DSC03055.jpg

I doubt there is room for a heat shield in the current configuration.

Thanks in advance, and again apologies for moving in on your thread Kelly.

Clive Whittfield
Auckland
New Zealand
RV6, firewall forward, systems etc

N282S · #10 11-05-2009, 06:38 AM

Okay, this is a little off topic but I noticed a couple of things in your pix. First, what kind of blue tubing are you using for the breather line and second. I noticed a hole drilled in the aluminum breather line. Would this be for freezing protection?

Thanks.

[quote=N941WR;373135]Ditto for me. I tried my best to get two inches between the fuel line and the exhaust and even then I added some heatshields clamped to the exhaust to protect the fuel line.

Remember, things move around a good bit in there. Some of it because of engine vibration and some because of the volumn and speed of the cooling air.

Fuel line gap (Before installing heat shields):