jeep/chevy conversions - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 07-08-2009, 05:56 PM
Thread Starter
  #1
Jeeper
 
Felsengleiskette's Avatar
 
Join Date: Sep 2005
Location: Detroit,Michigan
Posts: 600
jeep/chevy conversions

anyone have a non computer controlled chevy 350 in their junk? is it running normal temps? if so please tell me what products you are using. my 85 350 is running HOT! i have hi-flow water pump, 2200cfm elec. fan, aluminum 2 row cross flow radiator, 185* thermostat, my control box for the fan kicks my fan on at 195*. i run pretty much fine while driving, but even one red light i jump up to 230* in the span of one red light. once this happens, i drive off and my temps go back down to 196-206. but after a few red lights, my cooling temp stays high at around 216* . what gives??? my core of my radiator measures 16"x17.5. my fan is a 16" so even WITHOUT a shroud i barely have any surface of the rad exposed outside of the fan diameter. so PLEASE help if you can. we will also assume that the engine is mechanically sound, and NOT adding to the heat problem.(no coolent passages in the water jacket are blocked by head gaskets or anything.) also, my pressure in the rad is high...i have a 16lbs. rad cap. and now the side tanks are "weeping" from the pressure. my upper hose feels like concrete! my heater core hoses are BOTH hot and fluid in them, so i dont believe i have a blocked core.(unless it is blocked and the fluid in both hoses is comming FROM the engine instead of circulating) any other info i can give to help you help me i'll give right away.) again please help.-dave

__________________
mine: 95' YJ-4"lift (Skyjacker) 2" body lift. chevy 350/th400/np241 swap. herculined interior, boat drain plugs for floor. TJ hood. 33" MTR. Up next: bigger axles.
Felsengleiskette is offline   Quote
Old 07-08-2009, 06:17 PM   #2
Senior Member
 
Join Date: Sep 2008
Posts: 2,772
That 350 stock? (not to the jeep, I know). A cam? Bored? Etc? What is the compression you are getting?

That rad seems pretty small for a mouse motor as it is. Most of them needed a 24" triple row steelie to do the job and I'm not exactly sure just how much more efficient an aluminum rad is. And how "hi flo" is that water pump? With a small rad and too much pressure the coolant may not have time to cool before it hits the block again (especially sitting still).

Oh, and if you have the shroud, put it on. It's not just how much fan blade coverage on the rad that's important, it's focusing the airflow. If the fan spins too fast the air can escape by flowing around the rad instead of thru it. Give it a try too. Should be quick and cheap if you have a shroud.

stevens243 is offline   Quote
Old 07-08-2009, 08:44 PM   #3
after birthday glow
 
morphious's Avatar
 
Join Date: Jul 2009
Location: wisconsin
Posts: 1,963
never had that prob and i thought i'd seen all the dumb stuff chevys did if its stock i would say that the hi flo pump is is culprit is say try a stock one if u can and go from their and if that dont work time for a bigger rad
morphious is offline   Quote
Sponsored Links
Advertisement
 
Old 07-08-2009, 09:00 PM
Thread Starter
  #4
Jeeper
 
Felsengleiskette's Avatar
 
Join Date: Sep 2005
Location: Detroit,Michigan
Posts: 600
ok, my motor is basically stock. standard bore, 76cc pedestrian heads, cam is off idle-5500, headers, 600cfm carb, hi-flow oil pump (pan extra capacity) separate trans cooler (mounted in front) NOW, i switched to a hi-flow h2o pump because of the high temps. it was running hot before i switched it out. i bought and it was delivered today a 22" triple row downflow rad. (but it has built in trans cooler) and im going to shroud my fan....but is the 2200cfm fan going to cut it? if not i'll have to buy a 3300cfm one (at $306 bucks---yuck) but it will come w/ a shroud. another thing i noticed is my catch can never seems to fill w/ coolant above the level of what i put in it. i also bought a 13lb. cap. will this help or hurt? i'm nervious about the triple row only because the tubes are 1/2 inch and the thickness of the core is now 1/8 NARROWER than the aluminum two row one inch tubes. should i use the built in trans cooler, or should i re-use the seprate trans cooler? oh, my original rad cap was 16lbs.
__________________
mine: 95' YJ-4"lift (Skyjacker) 2" body lift. chevy 350/th400/np241 swap. herculined interior, boat drain plugs for floor. TJ hood. 33" MTR. Up next: bigger axles.
Felsengleiskette is offline   Quote
Old 07-08-2009, 10:47 PM   #5
Senior Member
 
Join Date: Sep 2008
Posts: 2,772
IF you have a new rad and a shroud try that first. I'm thinking that the shroud will do the trick and if not, at least you didn't spend any more money to find out.
stevens243 is offline   Quote
Old 07-08-2009, 11:06 PM   #6
after birthday glow
 
morphious's Avatar
 
Join Date: Jul 2009
Location: wisconsin
Posts: 1,963
well yes the lines in the rad is smaller but the less coolant in the line per volume would cause the coolant to cool faster and any flow probs should be nonexistent due to another row as far as the trans cooler ur call both will work but what do u want to take the time to do and the cap wont hurt but if u are running high presser it might pop but its only three pounds so it should be OK oh and one last stupid quest ion did u ever check to make sure the gauge is not the prob
__________________
some say why i say
its a jeep thing u wouldn't understand
morphious is offline   Quote
Old 07-08-2009, 11:52 PM
Thread Starter
  #7
Jeeper
 
Felsengleiskette's Avatar
 
Join Date: Sep 2005
Location: Detroit,Michigan
Posts: 600
yeah, boil tested the gauge. right at 212. ok, i'll install the new rad. and i'll use the trans provisions. i'll make a shroud out of some aluminum sheet. i'll let ya know...

__________________
mine: 95' YJ-4"lift (Skyjacker) 2" body lift. chevy 350/th400/np241 swap. herculined interior, boat drain plugs for floor. TJ hood. 33" MTR. Up next: bigger axles.
Felsengleiskette is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
JB Conversions Super Short SYE y0diggy TJ General Discussion Forum 32 10-05-2007 08:30 AM





All times are GMT -5. The time now is 08:52 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeepģ, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.