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post #1 of (permalink) Old 02-08-2001, 06:49 PM Thread Starter
 
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2\" exhaust vs. valves

I want to put on a 2" exhaust system from the cat back and use only a glasspack as mufflerage. The cat is just a hollowed out shell now. My concern is that I might burn a valve. Are the 1.3 valves pretty tough, or do they have a pension for burning. I know this will reduce my backpressure greatly, I just worry how greatly.

FRANKENZUKI,10 foot tall and bullet proof!
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post #2 of (permalink) Old 02-08-2001, 07:08 PM
 
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Re: 2\" exhaust vs. valves

shawn, i put a hedman header with a free flow cat & dynomax turbo muffler with 2" tubing on my 88 about 3 years ago , drove it from tampa, fl to big bend national park & to tellico & blairsville several times as well as thousands of miles around florida (sold it to a friend when i decided to build a cj-7 & he drove it daily) bought it back , just put a cam in it & haven't had a minutes problem with it-i say go for it!!
cueball

cueball
88 hd-top,1.3with weber, calmini cam,headers & 2" exhaust, jacobs ignition, 3" national spua , 4.16 tc gears, 88.5 5th gear,29x10.50 swamper tsl sx's
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post #3 of (permalink) Old 02-09-2001, 01:25 AM
JKing
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Re: 2\" exhaust vs. valves

how could you burn your valves with that setup? have not heard of such thing happening.

I've got no cat and a straight out cherry bomb muffler and no problem....???????

JKing
Suzuki Samurai (known as Jimny SJ413 in Asia)
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post #4 of (permalink) Old 02-09-2001, 02:35 AM
 
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Re: 2\" exhaust vs. valves

Modifying a carburated engine to "breath" better usually has the effect of leaning out the fuel mixtue which can burn a valve.
However I've never heard of Samurai's having this problem. I wonder if the ECM in conjunction with the O2 sensor compensates
for a free flowing exhaust? Anybody know,got any theories?


rollerskate
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post #5 of (permalink) Old 02-09-2001, 07:37 AM
MRLoneWolfe
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Re: 2\" exhaust vs. valves

Ide say that if you ran her with no exhaust that might be a problem!2"- GO FOR IT!

MRLoneWolfe AKA THROTTLE MONGER,1988Sami SPUA,5in Calmini,lockrites,TSL Thornbirds,YOR-bumpers and rockrails,Sidekick seats,z-link,YOR-pumkin protectors,1.3+.030
post #6 of (permalink) Old 02-09-2001, 10:42 AM
JKing
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Re: 2\" exhaust vs. valves

agreed that modifying exhaust to larger tend to lean out the mixture but you should anyway re-tune the mixture and idle after the upgrade to larger pipes. re-calibrating the mixture should solve the problem.

JKing
Suzuki Samurai (known as Jimny SJ413 in Asia)
K&N Air Filter, Shackle Lift, Larger Than Stock Tires, 1" Wheel Spacers, Driving & Spot Lamps, Tokico Shocks
Kuala Lumpur, Malaysia
post #7 of (permalink) Old 02-09-2001, 11:09 AM Thread Starter
 
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Re: 2\" exhaust vs. valves

The GO FOR IT'S have it. I'm doin' it. I will however adjust the carb accordingly. As far as the ECM changing anything to do with the carb, it's a modified hitachi, no ECM needed and no vacumn secondaries. Thanks all for the push in the right direction!

FRANKENZUKI,10 foot tall and bullet proof!
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