VintAGE-Vans

Would you like to react to this message? Create an account in a few clicks or log in to continue.

BRINGING IT ALL TOGETHER.... A's, G's & E's


5 posters

    Overheating issues and vapor lock

    jifop
    jifop


    Number of posts : 65
    Location : Hertfordshire, UK
    Registration date : 2016-05-22

    Overheating issues and vapor lock  Empty Overheating issues and vapor lock

    Post by jifop Sat Aug 13, 2016 5:30 am

    Hey guys, I'm hoping some can offer me some advice. My vans finally on the road but it's got some issues, it's a 302 V8, holley carb with C4 transmission and an electric fan and no belly pan.

    I drove the van on its longest trip yesterday and after about 15 mins stopped at a mates and it wouldn't start, I didn't notice what temperature it was at this point but the fan was running so I assume over 85°C

    The fuel filter was empty and it wasn't drawing fuel up to the carb, it has an electric pump and it was spinning but no fuel was coming up, after 10 mins it started fine so I drove on for another 20 mins. by the time I got to my destination the temperature gauge was reading 120°C and it then proceeded to dump most of its water out of the over flow pipe.

    I know it needs a belly pan but I'm thinking there's more at play here than just that causing the overheat? The 302 is running headers which chuck out heat so I will wrap them, also someone else mentioned that there should be a spacer between the carb and the inlet manifold.

    Thanks guys

    Tim
    dix
    dix
    Moderator 1st Class
    Moderator 1st Class


    Number of posts : 8726
    Location : pittsburgh pa
    Age : 66
    Registration date : 2008-05-29

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by dix Sun Aug 14, 2016 3:35 am

    the 1 st things i'm thinking is install a new mechanical gauge ,
    and 2nd is the electrical fuel pump is made to push so it should be near the gas tank.
    away from engine heat


    _________________
    still vannin since 1974
    jifop
    jifop


    Number of posts : 65
    Location : Hertfordshire, UK
    Registration date : 2016-05-22

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jifop Sun Aug 14, 2016 5:46 am

    I can do that but it's definitely still overheating.

    It is next to the fuel tank.
    jrdunn96
    jrdunn96


    Number of posts : 690
    Location : Cashion, OK
    Age : 62
    Registration date : 2016-01-01

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jrdunn96 Sun Aug 14, 2016 6:07 am

    What radiator do you have? Do you have an engine driven fan in addition to the electric fan? It takes a very powerful electric fan to replace the engine fan. (See "Taurus fan".) You may have sludge in your radiator or even inside you engine block. I assume you have checked your thermostat. . . Just throwin' stuff against the wall to see what sticks.
    Jim
    jifop
    jifop


    Number of posts : 65
    Location : Hertfordshire, UK
    Registration date : 2016-05-22

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jifop Sun Aug 14, 2016 6:47 am

    Hey thanks for that, I don't actually I just have an electric fan, I doubt that I could physically fit a mechanical fan in aswell. Tbh I can't imagine it's a particularly high powered one as the previous owner was a bodger..

    The thermostat is however new!
    jrdunn96
    jrdunn96


    Number of posts : 690
    Location : Cashion, OK
    Age : 62
    Registration date : 2016-01-01

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jrdunn96 Sun Aug 14, 2016 7:02 am

    I just reread your original post, is your transmission cooler run through your radiator? Our doghouses are great ovens, not great air ducts. Vic(aka Oldskool) has a lot of wisdom on here about overheating issues. He recommends using a separate tranny cooler mounted (with it's own fan) underneath, not using the cooler in the radiator at all. He does dish out a lot of wisdom on here. I don't have an auto in mine, but I do know they can generate a lot of heat. Try this.
    https://vintage-vans.forumotion.com/t47057-transmission-cooler?highlight=transmission+cooler
    jifop
    jifop


    Number of posts : 65
    Location : Hertfordshire, UK
    Registration date : 2016-05-22

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jifop Sun Aug 14, 2016 8:14 am

    Hey, the trans cooler runs seperately out to the front grill.

    I've just been out to look and the 16" fan is unbranded, Do you think the cheap electric fan could be the route of this?

    I've seen some 3500cfm fans online that I could fit instead if that will make a big difference
    jifop
    jifop


    Number of posts : 65
    Location : Hertfordshire, UK
    Registration date : 2016-05-22

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jifop Sun Aug 14, 2016 9:36 am

    Going through the boxes of parts that came with my van I've found the original fan. It's only a little four blade one but was thinking that plus the electric one might be enough?
    jrdunn96
    jrdunn96


    Number of posts : 690
    Location : Cashion, OK
    Age : 62
    Registration date : 2016-01-01

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jrdunn96 Sun Aug 14, 2016 12:02 pm

    Your trans cooler is still "preheating" your airflow to some extent.
    There is a lot of discussion about cfm, efficiency and such. 3500 cfm should be enough airflow but . . . I have read that some rate their fans with 0 restriction and others rate them with varying restriction. I have been told a "puller fan" works a lot better than a "pusher".
    Especially on a V8, I'd like to see more blades on the engine driven fan. If you have a pusher fan, you might try both. Remember your V8 is a lot wider than an I6, so it is restricting airflow in the doghouse as well. To come up with a "cost effective" solution, you may have to experiment a little. Be very careful to watch your engine temp as you test your experiments. One of the member's signature on this forum states, "I watch my temp gauge more than my speedometer".
    Without restrictions on cost or availability, I would go for the Taurus fan and an alternator upgrade. I don't know about you, but I haven't had a project where cost and availability aren't limiting factors.
    Also please remember a lot of this info I have read or been told. Then I filter it through my old memory. So, it's the best I've got. I truly hope this helps.

    Jim
    jrdunn96
    jrdunn96


    Number of posts : 690
    Location : Cashion, OK
    Age : 62
    Registration date : 2016-01-01

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jrdunn96 Mon Aug 15, 2016 7:42 pm

    Oh by the way, since you have a new thermostat. There's not any chance you installed it backward is there? Yeah, I have done that.
    jifop
    jifop


    Number of posts : 65
    Location : Hertfordshire, UK
    Registration date : 2016-05-22

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jifop Mon Aug 29, 2016 11:40 am

    Hey chaps, so I installed a 14" flexalite fan on the engine in addition to the electric fan and while driving today my engine temp sat around 195°F which I think is still too high however I then sat in slow moving traffic for 35 mins and it climbed back up to the 250°F that it hit last week and my revs were dropping so I pulled over for it to cool down.

    I'm definitely getting somewhere with the cooling as this is a vast improvement on last week, I haven't made a belly pan yet but I assume that will help further aswell as wrapping the headers?

    I also wondered if anyone has put fans on the front grill to assist airflow or whethere that is pointless?
    Barnabas
    Barnabas
    Vintage-Vans Listings Manager
    Vintage-Vans Listings Manager


    Number of posts : 2011
    Location : Raleigh, NC
    Age : 64
    Registration date : 2011-01-16

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by Barnabas Mon Aug 29, 2016 3:01 pm

    Did you try a belly pan? It keeps the hot air coming out of the back of the radiator from entering the front of the radiator.
    jifop
    jifop


    Number of posts : 65
    Location : Hertfordshire, UK
    Registration date : 2016-05-22

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by jifop Tue Aug 30, 2016 5:41 am

    Not yet, radiator shroud and belly pan are my next projects.

    Would you suppose they would be enough to control the heat?
    vanny
    vanny
    Moderator


    Number of posts : 14775
    Location : Ashburnham, MA
    Age : 64
    Registration date : 2012-09-22

    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by vanny Tue Aug 30, 2016 6:29 am

    One very useful tool is the Search tab at the top of the page. Just click on it and type in cooling and you will see many threads on the subject which has been talked about a LOT! You should be able to find some very useful information from others who have gone through this problem before.

    Hope this helps! Very Happy


    _________________
    “The future will soon be a thing of the past."

    http://public.fotki.com/Vintage-Vans/vintage-vans-es/ruff-diamond-1/?cmd=fs_slideshow

    Sponsored content


    Overheating issues and vapor lock  Empty Re: Overheating issues and vapor lock

    Post by Sponsored content


      Current date/time is Thu Mar 28, 2024 4:31 pm