hurley209

hey guys, i was thinkin of replacing my heater boxes with some j-tubes for a more performance oriented exhaust... i have a gt header...
should i do it?
will it make a big difference performance wise?
sound wise?
will it still be ok to drive around and cruise in it for as long as i want, it wont heat up the engine???

power??

thanks a bunch guys!

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Sleepwalker
Hey there,
First off by removing the heater boxes on your bug, you will not be adding anymore "heat" to the engine, unlike a water cooled system. The flow of exhaust gases from the engine will still follow the same path. If you think of it like this, the heat transfer into your bug is made in the area between outer skin and what for the most part is a "J" tube running down the center of your heater boxes.
As far as performance, unless you increase the ID of the tubes and exhaust system, none will be gained.

Couple of way I know of around this is to:
1. Replace the heater boxes, if you still want interior heat, with ones that have the larger ID pipes in them and normally come with a bolt flange for the rest of the exhaust system.
2. Replace the boxes with larger ID "J" tubes to do the same with no interior heat. Just don't forget to remove the flex tubes and close off the fresh air feeds at your fan shroud or you will be pumping heat right into the engine compartment.

As far as increasing the power through the use of a better exhaust system, I would point you to Ryan's article under [tech] - [High Performance 101] area. I think he has done an excellent job in covering the topic.

Hope that helps
"He who knows enough to learn, knows enough"
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bumblebee73
i agree with sleepwalker
http://s86.photobucket.com/albums/k92/my67truck/my%201641cc%20vw%20rail/

[URL=http://www.mybannermaker.com/link.php?nurl=http%3A%2F%2Fwww.mybannermaker.com][/URL]
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68autobug

Sleepwalker wrote:
Hey there,
First off by removing the heater boxes on your bug, you will not be adding anymore "heat" to the engine, unlike a water cooled system. The flow of exhaust gases from the engine will still follow the same path. If you think of it like this, the heat transfer into your bug is made in the area between outer skin and what for the most part is a "J" tube running down the center of your heater boxes.
As far as performance, unless you increase the ID of the tubes and exhaust system, none will be gained.

Couple of way I know of around this is to:
1. Replace the heater boxes, if you still want interior heat, with ones that have the larger ID pipes in them and normally come with a bolt flange for the rest of the exhaust system.
2. Replace the boxes with larger ID "J" tubes to do the same with no interior heat. Just don't forget to remove the flex tubes and close off the fresh air feeds at your fan shroud or you will be pumping heat right into the engine compartment.

As far as increasing the power through the use of a better exhaust system, I would point you to Ryan's article under [tech] - [High Performance 101] area. I think he has done an excellent job in covering the topic.

Hope that helps


I also agree with sleepwalker

there are larger ID heater boxes which will allow the exhaust gases to flow thru faster
but We are looking at High Performance multi carburetor units there..

for the standard engine - J pipes - heaters = no difference

extractor exhaust system is supposed to give You a few more horsepower
but I've never noticed any...

I did however feel More horsepower with an electronic ignition system..

LEE


68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

http://community.webshots.com/user/vw68autobug
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hurley209
cool! thanks for the tips guys... im keeping the heater boxes then... i like staying warm in the winter..lol.....

ok, so would you guys reccomend any performance enhancing products>?

i already have dual carbs....
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olspeed
Ho man
Quote:
ok, so would you guys reccomend any performance enhancing products
Well... how much do you want to spend. You already have dual carbs"but which ones?" I would think that without tearing the engine down. I would go for electronic ignition next, then maybe high lift rockers and well from there how heavy is the wallet? Read the performance 101 articles on this site and then sit back with a good cup of coffee"or other suitable form of refreshment"  Start with what you have and then think about what you want. A light to light rocket, or a freeway flier,or something in between. And from there what's the cash flow,start with what you can afford and save for the rest.
Olspeed
66 Ghia, "Dexter" 76 flat window Beetle
It's not a Car it's a VolksWagon!
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hurley209

ok, im gonna go get my coffee, and read..lol.. nothing like a nice fresh brew in the morning

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YELLRHD
Another great read is here
http://www.aircooled.net/gnrlsite/resource/articles/mods.htm



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