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johnnyniceguy
Samba Member
Joined: July 24, 2005
Posts: 287
Location: Minnesota
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 Posted: Tue Oct 23, 2007 6:46 am Post subject: 25 hp cool weather |
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| Have a 25 hp that is so cold blooded when temps get below 50 F. Starts good but pops and farts till really warmed up. Sometimes runs 10 minuites before ready to go. If above 50 degrees it runs perfectly. Am I too lean/rich? |
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thom
Samba Member
Joined: October 12, 2000
Posts: 5943
Location: Sacramento
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| Posted: Tue Oct 23, 2007 7:12 am Post subject: |
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Is your heat riser clogged?
Are you running a VFIS or PCI carb?
Even been in a men's locker room?
Are you using the choke?
Sounds like you might need to be a little more patient in the mornings.
_________________
-Thom
1956 Single Cab
1957 Porsche 356A Sunroof
1957 23-Window Deluxe
1957 Mercedes Westfalia single cab
1963 Unimog 404
1965 E-Type |
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johnnyniceguy
Samba Member
Joined: July 24, 2005
Posts: 287
Location: Minnesota
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| Posted: Thu Oct 25, 2007 9:07 am Post subject: |
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| Thanks guys! all is in good shape...riser etc. Oct. 52 Zwitter. I live in Minnesota; so weather is real cool right now. I'm sure Thom doesn't understand that. John H should know what cool weather is and know it isn't going away soon. Thought maybe someone expierienced same effects on 25hp. I have lots of patience but 10-15 minuites to warm up doesn't seem quite right. Any more ideas?? Coil??? |
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johnshenry 
Samba Member
Joined: September 21, 2001
Posts: 9364
Location: Northwood, NH USA
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| Posted: Thu Oct 25, 2007 9:25 am Post subject: |
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Yes, I know all about cold weather.....!
Intake and carb icing is usually more a function of humidity than temp, although it will usually only occur below out 50F. I
After you have driven the car for a bit (20-30 mins or so) , feel the left side heat riser. If it is warm/hot, the HR is working and not clogged. Compare it with the right side (careful, it will be hot).
Look at the carb body where it meets the intake, basically the botom half. If it is frosty, or even with a lot of condensation, you may have an icing problem. I was told once that re-jetting can help, but I am not a carb expert so I don't know the details.
Of course check you valves settings, timing and points gap EVEN if you already did.
_________________
John Henry
'57 Deluxe
'56 Single Cab |
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nlorntson
Crazy VW Lady
Joined: March 13, 2004
Posts: 3783
Location: Twin Cities, MN
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| Posted: Thu Oct 25, 2007 5:15 pm Post subject: |
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| John, good to see you still have your 52. |
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johnnyniceguy
Samba Member
Joined: July 24, 2005
Posts: 287
Location: Minnesota
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| Posted: Thu Nov 01, 2007 1:28 pm Post subject: |
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| Sorry for the long delays in responding; I have a 28 pci carb. After a good road trip; I felt the riser on the left side and it was barely warm. The right side is hot as it shows with the lack of paint. It was 60 degrees outside temp. There was no sign of condensation. Took a long time to warm up but actually ran very well down the road. They are talking snow showers next week. I'm heading for cover. |
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johnshenry
Samba Member
Joined: September 21, 2001
Posts: 9364
Location: Northwood, NH USA
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| Posted: Thu Nov 01, 2007 1:44 pm Post subject: |
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| johnnyniceguy wrote: |
| Sorry for the long delays in responding; I have a 28 pci carb. After a good road trip; I felt the riser on the left side and it was barely warm. The right side is hot as it shows with the lack of paint. It was 60 degrees outside temp. There was no sign of condensation. Took a long time to warm up but actually ran very well down the road. They are talking snow showers next week. I'm heading for cover. |
Sounds like the heat riser is clogged. Unclogging it MAY help. Or you can replace the intake if it is not a rare one.
Article at my site thebugshop(.org) on clearing the intake heat riser. The "SRB" method is FUN! Lots of smoke and fire!!
(that was done with just a test piece of cut off riser tubing)
_________________
John Henry
'57 Deluxe
'56 Single Cab |
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johnnyniceguy
Samba Member
Joined: July 24, 2005
Posts: 287
Location: Minnesota
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| Posted: Mon Nov 05, 2007 12:43 pm Post subject: |
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| Thank You so much. Your web site has so much to offer! I'm off to unplug a heat riser. |
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