coolant bypass????
Thread Starter
Racer
Joined: Dec 2004
Posts: 455
Likes: 11
From: Clovis CA
coolant bypass????
what exactly does a coolant bypass entail??? is that something i can do on my 88 l98??? i live in a pretty climate controlled place, so cold temperatures arent an issue.
any help???
any help???
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Coolant bypass doesn't really help anything. I'm not even sure it applies to L98's. I know on LT1's there is coolant routed through the throttle body. Coolant bypass just takes the throttle body out of the coolant loop... bypasses it so coolant no longer flows through it.
Melting Slicks
Joined: Dec 2004
Posts: 3,219
Likes: 1
From: Somerset Co, NJ
Originally Posted by Lone Ranger
Coolant bypass doesn't really help anything. I'm not even sure it applies to L98's. I know on LT1's there is coolant routed through the throttle body. Coolant bypass just takes the throttle body out of the coolant loop... bypasses it so coolant no longer flows through it.
Exactly! I know with the coolant flowing through it, the TB is heated, (the metal itself), but to me, the flow of air is so great and fast, that the heat exchange from the metal of the TB to the intake air seems almost impossible, it (the air) doesn't have enough time to absorb the heat from the TB! Coolant bypass: a barb fitting connector, and two hose clamps, wowee! 
Burning Brakes
Joined: Dec 2004
Posts: 825
Likes: 0
From: Hanging out back with the dark horses. Wa.
the loop is an issue that... well lets say 
here on the forum. Same as MAFS screens. Do some reading and you make the choice.I say leave it alone. If it's not broke don't fix it......
Drifting
Joined: Oct 2003
Posts: 1,594
Likes: 0
From: CALGARY ab
Originally Posted by vinnies87
Put in in, took it out, no difference either way...
wow....
...using a 195* tstat and doing the TB bypass, the temperature of the TB intake is some 25* +/- 5-8*lower that the intake manifold..so the end result is, less heat transfer/conduction of the incoming air. more cooler air entering the system which in turn yields higher combustion force. just my opion 
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Disconnect the hoses on either side of the TB and either mate them together with a pipe and 2 clamps, or get some 5/8 heater hose and run one big hose like I did.
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Racer
Joined: Aug 2004
Posts: 377
Likes: 1
From: Redmond Wa
Originally Posted by vader86
get some 5/8 heater hose and run one big hose like I did.
Yep.. That's what I did. Figured it couldn't hurt and would probably add up to something on top of all the other mods I have done or plan to do. 
Drifting
Joined: Oct 2003
Posts: 1,594
Likes: 0
From: CALGARY ab
Originally Posted by vader86
Disconnect the hoses on either side of the TB and either mate them together with a pipe and 2 clamps, or get some 5/8 heater hose and run one big hose like I did.
this mod was done before but I'm in the last stages of motor rebuild.. i removed all the hoses, built aluminium tee fitting for that 1/4" line to rear manifold and rerouted 3/4" line direct in WP and 5/8" to intake manifold ..
PS: ..not exactly riveting power/hp increase, but noticable difference in fuel mileage
.
Last edited by korvette4u; Feb 11, 2005 at 01:08 AM.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Note that one coolant hose goes into the TB and one comes from the TB and runs back to the heater.
Buy a U formed piece of heater hose, a plastic hose splice, two hose clamps and two large vacuum nipples.
Remove the short hose that goes into the TB, cut the new U piece of hose so that it plugs into the fitting and goes up under the TPS and down behind the AC compressor. Remove the heater hose from the TB and cut it so that it mates up with the U hose. Splice the two hoses together. Press the two vacuum nipples onto the TB fittings and you are done.
Buy a U formed piece of heater hose, a plastic hose splice, two hose clamps and two large vacuum nipples.
Remove the short hose that goes into the TB, cut the new U piece of hose so that it plugs into the fitting and goes up under the TPS and down behind the AC compressor. Remove the heater hose from the TB and cut it so that it mates up with the U hose. Splice the two hoses together. Press the two vacuum nipples onto the TB fittings and you are done.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I noticed no difference whatsoever. science says it'll help a little bit, but the biggest effect is cleaning up your engine bay.
I routed my bypass hose under the a/c.
I routed my bypass hose under the a/c.
Melting Slicks
Joined: Jun 2004
Posts: 2,453
Likes: 81
From: Fishin' Pole FL
If you ever want to take your throttle body off you won't have to fool with the coolant hoses. I think i read on a thread where you could replace the top radiator hose with a '96 because it doesn't have the T-splice and on the heater side just cut it short, plug it off , and point it down and out of sight.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
Originally Posted by dndrsn
If you ever want to take your throttle body off you won't have to fool with the coolant hoses. I think i read on a thread where you could replace the top radiator hose with a '96 because it doesn't have the T-splice and on the heater side just cut it short, plug it off , and point it down and out of sight.
IMHO, the biggest benefit is not having to mess with coolant lines when I need to remove my TB. Since I live in Texas, I am not worried about TB freezeup.
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Originally Posted by CentralCoaster
I noticed no difference whatsoever. science says it'll help a little bit, but the biggest effect is cleaning up your engine bay.
I routed my bypass hose under the a/c.
I routed my bypass hose under the a/c.
I noticed that when the engines hot it's hot. I also did it for engine cleanup and ease of TB removal. I went as far as totaly removing the coolant passage and barbs from TB 
Theres no turning back now
