| Pre-Heater Hose [message #251966] |
Wed, 11 June 2014 13:51  |
mickey szilagyi
Messages: 273
Registered: January 2013
Karma: 0
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Our 403 didn't have a pre-heater hose running from the manifold to the air filter when we got our 77 Kingsley and we figure it would be good to put one on. Called around and there are two that we can get. One is aluminum, 2 inch diameter, 18 inches long for about $8. Then there is another one with the same dimensions only aluminum and fiberglass for about $25. We have no idea if the aluminum one is good enough or if there's an advantange of having the one with fiberglass. Anyone kind enough to offer an opinion is greatly appreciated.
Hope this question isn't like the which-is-the-best-engine-oil-to-use question.
Thanks!
Mickey
1977 Kingsley, 403, Lansing, MI
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| Re: Pre-Heater Hose [message #251971 is a reply to message #251970] |
Wed, 11 June 2014 14:26  |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
Karma: 0
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Many (most?) people don't bother with them. They really don't accomplish much unless it is really cold out, and even then I doubt you'd notice. Here in WA even in freezing weather I see no difference with the hose removed. If you do choose not to replace it, make sure the vacuum line to the carb is plugged.
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
[Updated on: Wed, 11 June 2014 14:27] Report message to a moderator |
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| Re: Pre-Heater Hose [message #252014 is a reply to message #251966] |
Thu, 12 June 2014 11:27 |
Jon payne
Messages: 495
Registered: May 2008
Karma: 1
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When I installed headers I never bothered to reconnect the carb heat and had no issues. However, after installing the aluminum intake I found that it was necessary to have the carb heat for the first cold start of the day. Otherwise it would sputter when I would first start driving. After reinstalling the carb heat, I can now start the engine,wait 30 secs or so and drive off with no sputtering.
Conclusion: With OEM intake and no exhaust block off plates, carb heat not needed. With AL intake or OEM with exhaust block-off plates, carb heat suggested if improved drivability is desired during warm-up.
Jon
Jon Payne
76 Palm Beach
Westfield,IN
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| Re: Pre-Heater Hose [message #252027 is a reply to message #251966] |
Thu, 12 June 2014 16:11 |
Gary Carlton
Messages: 59
Registered: February 2014
Karma: 0
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I have headers, no pre-heat tube and block off plates. Driveability was sketchy until the thing was fully warmed up which took quite a while. I tried an electronic choke but with no heat directly to the carb (only radiant), the choke plate was opening far too soon and again driveability sucked. I worked around the cold-blooded-beast problem by installing a manual choke. $10 and about an hour to install (most of that time was spent finding the JUST THE RIGHT place for the knob). Drives great now.
'78 Royale, "Road Grub"
Bellingham, WA
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| Re: Pre-Heater Hose [message #252028 is a reply to message #251971] |
Thu, 12 June 2014 16:18 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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When I still lived in Michigan I noticed a cold drive-ability difference with out the hose. It would sag shortly after a cold start as the choke started to open up. Later I went from ported to full manifold vacuum for the distributer and the cold drive-ability dramatically improved even with the hose off.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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