Air box removal to access carburetters
#81
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The main reason I did this was to reduce the intake air temperature. The engine bay gets very hot in these cars, I was routinely recording air temperatures of 100°C when I used the original air cleaner. Hot air is bad for both loss of power and it leads to detonation. The engines are already prone to detonation due to the combustion chamber design, so I didn't want to add to the troubles.After I changed to the under fender style air filter I was recording maximum temperatures about 10° above ambient, and at highway cruise only 2-3° above ambient.
I had a look and I don't have any photos of the filter, but it did fit with little effort in front of the tire. There are various lids with different length and sizes of trumpets, I took a shorter one, I think it was from a late XJ40 or early X300, so somewhere in the 1993-97 range.
To make it neater, I probably would have put the filter in the right wheelarch again, and moved the vacuum reservoir. However, that would require doing something different to join to the carbs.
Last edited by Jagboi64; 06-07-2022 at 04:05 PM.
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Peter3442 (06-07-2022)
#82
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Some before and after examples are here: http://www.universalcycle.ca/content...apor-Blasting/
Last edited by Jagboi64; 06-07-2022 at 04:04 PM.
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Bill Mac (06-08-2022),
Glyn M Ruck (06-07-2022)
#83
Join Date: Jul 2012
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#84
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Glyn M Ruck (06-09-2022)
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Bill Mac (06-10-2022)
#86
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The rear carb from the setup I got for practice cleaned up amazingly well. It took about three trips of forty minutes through my ultrasound cleaner. Today with all of the parts in hand and some time spent reviewing the various instructions for the "routine service" from the SU shop manual, the front carb service is going well. The prongs on the forked lever were about 3/8 inches instead of the recommended 7/16. Because I am a rookie, I don't know if I should be concerned about how much hard black stuff was in the intake body and in the piston/suction chamber. The ultrasound will clean the float chamber lid and the piston/suction chamber eventually. After the lid was off of the float chamber, blowing through the inlet, increasing incrementally from 3/8ths to 15/32nds, got a seal. I don't know how much upward force the float puts onto the lever, but my lungs will go to about six ounces of pressure per square inch. In any case, the consensus of the posts in this thread is that the overflow problem is the float needle and seat, and that is surely correct due to a lack of seal and the fuel level set too high.
The rear carb intake is very black also. I'll take it apart after I get the front one back together.
The rear carb intake is very black also. I'll take it apart after I get the front one back together.
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Glyn M Ruck (06-14-2022)
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