Moparchat - Home of MOPAR enthusiasts worldwide!



Go Back   Moparchat - Home of MOPAR enthusiasts worldwide! > Technical Forums > Performance Talk

Click here to search for Mopar cars and parts for sale.


Reply
 
Thread Tools Display Modes
  #1  
Old 03-01-2005, 07:16 AM
runedawg runedawg is offline
Inactive User
 
Join Date: Nov 2004
Location: hedgesville, WV
Posts: 66
Question Holley Carb Icing

How can you tell when its icing. Damn thing runs alright when its above 2krpm but when its below freezing it wont idle worth a crap until it runs for about 1/2 hour between 2k and 4k rpm. ( driving up and down the road. I have a 40 min. commute to work. ) The idle is set right or at least it idle great when its warmer or not having this problem. Its a model 4160 carb.

This truck is realy gettin under my skin!!! Seems like at least once a month something breaks or goes wrong with it.
Reply With Quote
  #2  
Old 03-01-2005, 08:38 AM
dwc43's Avatar
dwc43 dwc43 is offline
Banned
 
Join Date: Sep 2002
Location: Shelbyville,Tn.
Age: 54
Posts: 23,987
Biggrin

Open the hood and there will be ice on it. I've only had one do this in all my years and it was on a stock carter 318 '68 Ply. Satt. It's most likely in that junky holley your running. I'd get a stock 800 cfm thermoquad and put on it and you wont have any more porblems.
Reply With Quote
  #3  
Old 03-01-2005, 09:09 AM
dusterbd's Avatar
dusterbd dusterbd is offline
Inactive User
 
Join Date: Feb 2001
Location: ablemarle, nc
Age: 42
Posts: 938
Default

hollys are notorious for having to be recalibrated every couple of days. that is, unfortunate. on the other hand, hollys are known for making more power according to the butt-o-meter than other carbs. for the fact that your truck is a daily driver, dwc is right. run a carter. it sucks, because of the expense involved, but then again, the hassle will be eliminated.
also, depending on how cold it is where you live, like alaska, you may need to do some much further tuning to your choke setup.
good luck. if you give us more info, we might be able to help more.
michael
Reply With Quote
  #4  
Old 03-01-2005, 09:24 AM
B.Tallent B.Tallent is offline
Inactive User
 
Join Date: Nov 2000
Location: Co. U.S of A
Age: 67
Posts: 173
Default

you can check the manifold heat crossover,if it has been plugged off for performance reasons. alot of people did that because of fuel perc. but it means pulling the intake to see if it has the block off plates,also you can remove the carb insulator for winter,but then when it gets warm you will have fuel perc.in the carb.
Reply With Quote
  #5  
Old 03-01-2005, 10:51 AM
runedawg runedawg is offline
Inactive User
 
Join Date: Nov 2004
Location: hedgesville, WV
Posts: 66
Default

The EGR has been blocked off. I live in West Virginia. It usually does it if it is under freezing temp or below thats why I was wondering about ice. As far as the manifold heat croosover i havent a clue. I know it still has the flapper valve( not sure if that is what it is called ) on the bottom of the exhaust manifold. I think its on the passenger side but it isnt connected to anything if it is supposed to be. As for as the choke I had an electric choke but had all kinds of problems with it so I converted it to a manual and it didnt make a difference as to how it started in the warm or in the freezing cold so I took it off completley. Across the street from my house is a plymouth van with a 360 in it but im not sure on the carb. I know its there I just dont know what it is. If it is a thermoquad or carter will it bolt on to my eddie or will I need an adapter.
Reply With Quote
  #6  
Old 03-01-2005, 11:23 AM
Kevin Garceau Kevin Garceau is offline
Inactive User
 
Join Date: Jan 2003
Location: Mauston Wisconsin
Posts: 1,213
Default

Well you live in WV, it cant get that cold. I dont understand teh whole issue. It did this with and without a choke on it? That doesnt sound right...



Personally I would take a holley any day over the other carbs listed, but that is just me and thats what I know. I know zero about the rest of them out there.

Heck up here Im pretty sure it gets colder than WV, was a balmy 9 degrees when I came to work this morning. I never heard of this trouble with any types of carbs.
Reply With Quote
  #7  
Old 03-01-2005, 11:57 AM
dwc43's Avatar
dwc43 dwc43 is offline
Banned
 
Join Date: Sep 2002
Location: Shelbyville,Tn.
Age: 54
Posts: 23,987
Biggrin

Quote:
Originally Posted by runedawg
The EGR has been blocked off. I live in West Virginia. It usually does it if it is under freezing temp or below thats why I was wondering about ice. As far as the manifold heat croosover i havent a clue. I know it still has the flapper valve( not sure if that is what it is called ) on the bottom of the exhaust manifold. I think its on the passenger side but it isnt connected to anything if it is supposed to be. As for as the choke I had an electric choke but had all kinds of problems with it so I converted it to a manual and it didnt make a difference as to how it started in the warm or in the freezing cold so I took it off completley. Across the street from my house is a plymouth van with a 360 in it but im not sure on the carb. I know its there I just dont know what it is. If it is a thermoquad or carter will it bolt on to my eddie or will I need an adapter.
Holleys are bad about icing over and I've seen them do it in 90* weather too. It's not the temp out side that does it. I'ts the moisture content in the air and the increased air speed in the venturi that causes one to ice over. And like dusterbd said, holleys need tunning every 5 mins. no matter what car they are on. The van with the 360 either has a stock Carter BBD 2 bbl carb or a stock 800 cfm Carter Thermoquad on it. IF your using a squarre bore intake you will need the adapter which will give you a litte more hp any way. The Thermoquad is much more throttle responsive than any holley and you would really like that on a street car. We use them with very little mods on our racecars too. Even with major tunning we can't get a holley to out preform the Thermoquad on our race engines when rules make us use them. Plus you can use a stock electric manifold type choke on it or use the manual choke on it.
Reply With Quote
  #8  
Old 03-01-2005, 12:49 PM
rumblefish360's Avatar
rumblefish360 rumblefish360 is offline
Moparchat Bronze member
 
Join Date: May 2000
Location: C
Age: 57
Posts: 11,120
Default

Kevin Garceau, It gets a little colder in West Va. than you think.

runedawg, go back to the electric choke. It is an excellent device for even street strip rides. Follow the directions and measure carefully. B.Tallent has good ideas.
Also, are you running an open air cleaner? Do you have a heat stove that runs to the cleaner? You may be a tad lean. Once the carb warms up a little, and it is running right @ or under 2,000 rpm's, the cold air from outside increases speed and cools of the carb just enuff to make it run crummy.
There may also be some small amount of water in the fuel line.

The T-Q, if under the hood of the van, is a direct bolt on for the performer intake. A T-Q is a Carter. If your thinking of the Edel. AFB, it should bolt right on. Edel. sells a plate to install under the carb to take up any areas not covered by the carb.

The "Flapper valve" is there to direct the exhaust gas back into the intake manifold to decrease warm up times. It heats the bottom of the intake.
Reply With Quote
  #9  
Old 03-01-2005, 12:50 PM
TK TK is offline
Banned
 
Join Date: Jan 2005
Location: not here anymore
Posts: 8,876
Default

Quote:
Originally Posted by dwc43
Holleys are bad about icing over and I've seen them do it in 90* weather too. It's not the temp out side that does it. I'ts the moisture content in the air and the increased air speed in the venturi that causes one to ice over. And like dusterbd said, holleys need tunning every 5 mins. no matter what car they are on. The van with the 360 either has a stock Carter BBD 2 bbl carb or a stock 800 cfm Carter Thermoquad on it. IF your using a squarre bore intake you will need the adapter which will give you a litte more hp any way. The Thermoquad is much more throttle responsive than any holley and you would really like that on a street car. We use them with very little mods on our racecars too. Even with major tunning we can't get a holley to out preform the Thermoquad on our race engines when rules make us use them. Plus you can use a stock electric manifold type choke on it or use the manual choke on it.
dwc is right, holleys for some reason do ice up at certain humidity levels?????????????????????????its a holley thing, never had good luck with them. up here, thermoquads never ice up, in fact, i think that was part of there desighn, not to be affectd by temp and humidity. holleys are not the only carbs that ice up, edelbrocks do it, those damn little 2bbl's on 318's do it, so your not alone. there are 3 things you can do, put a thermoquad on it, put a stock air cleaner/heat riser/and that power robbing carb heat systtem, or, you can do like i do, let it warm up for about 5 minutes, then, shut it off for about five minutes, this will "heat soak" your carb and intake maifold, and should keep it ice free unless the weather is extreme.
i ran a 318 with a offey dualport for 5 years with a 600 edelbrock and a 14"air cleaner and never had it ice up. the secret? let it warm up on low idle (700-900) the reason why this woks is because you keep the air speed thrue the venturi's low enough that it warms up bfore it ices up. unfortunatly, i dont think a holley will run at a low idle when cold so try the heat soak method
Reply With Quote
  #10  
Old 03-01-2005, 01:08 PM
MitchB MitchB is offline
Inactive User
 
Join Date: Feb 2001
Location: NY
Posts: 101
Default

Several different carbs by different manufacturers have given me icing problems even with a functioning heat crossover. In each case, I fab'd a 5/8" thick aluminum carb spacer that mounts between the carb and the manifold that circulates engine coolant through passages drilled in the body. Works great! Eliminated icing and greatly increased driveability.

Mitch
Reply With Quote
  #11  
Old 03-01-2005, 01:15 PM
TK TK is offline
Banned
 
Join Date: Jan 2005
Location: not here anymore
Posts: 8,876
Default

some -3 413's and 361's did that, works good.
Reply With Quote
  #12  
Old 03-01-2005, 02:41 PM
runedawg runedawg is offline
Inactive User
 
Join Date: Nov 2004
Location: hedgesville, WV
Posts: 66
BS!

I think I have already caught on to the heat soak method you were talkink about. Ive done it like twice but I just thought it was a fluke so I didnt pay much mind to it. The bad part about it doing this is that this is my 4wd and it seems like when it snows or gets icy the truck acts like HA HA idiot look what I can do.
Reply With Quote
  #13  
Old 03-01-2005, 03:21 PM
dusterbd's Avatar
dusterbd dusterbd is offline
Inactive User
 
Join Date: Feb 2001
Location: ablemarle, nc
Age: 42
Posts: 938
Default

believe me, i know the feeling. me and my best friend had a snow truck, 84 ram 3/4 tonner 4X4. we called it the millenium falcon. it only ran when we needed it to. any other time, it laughed at us. like "less than 3"? drive the 2wd trucks, gimpy." yeah, i showed it......
sold it to him
michael
Reply With Quote
  #14  
Old 03-01-2005, 03:22 PM
dodger1 dodger1 is offline
Inactive User
 
Join Date: Feb 2004
Location: Princeton BC
Age: 85
Posts: 2,648
Default

Cheap way out is the stock air cleaner + working carb heat. If you could find a dual-snorkel unit you should have enough airflow as long as the carb heat valve closes and the second snorkel opens when they should. I've had my share of iced carbs after 30 years of living on the Wet Coast. Never gets below freezing but the high humidity gets ya every time. I like Mitch's elegant solution, (used on some carbed imports). And of course the heat-soak method also works, as long as you don't have to leave RIGHT NOW!!
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Holley carb ? Aspen77RT Performance Talk 8 10-07-2003 08:41 PM
FS: Holley 750 CFM Carb rebby Parts for Sale 0 12-10-2002 02:58 PM
Carburater icing up ????? dodgit Performance Talk 20 12-04-2000 03:17 AM
Holley Carb ? Mopar1970440 Performance Talk 12 10-30-2000 08:32 AM
Holley carb, Help!!!! klonestar Performance Talk 47 09-13-2000 08:09 AM




All times are GMT -4. The time now is 06:51 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
. . . . .