Lotus Elan

odd!!?

PostPost by: Elanconvert » Tue Jun 24, 2014 5:22 pm

hi all
I've put this in free parking as there isno lotus content......
I need help with a pre-crossflow engine query.....
using a single weber 40dcoe and a lynx crossover inlet manifold, the engine runs ok, but exhaust pipe on no 1 cylinder is quite cool compared the others -very hot...........have swapped plugs /leads, compression test ok........
any ideas??????
I'm a bit baffled.....

:D fred
'Never give up!....unless it's hopeless.....'

1970 S4 dhc big valve
1973 Ginetta G15
1967 Ginetta G4 [sadly now sold]
1959 lotus elite type 14
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PostPost by: rgh0 » Tue Jun 24, 2014 11:19 pm

Assuming No4 is firing OK then you must have OK mixture and the carb is OK given your crossover manifold.

If you have known good plug and HT lead then I would also change the distributor cap and verify that your getting a good spark at No1.

Finally I would check the valve lift to make sure you dont have a worn down cam lobe. A worn lobe will still give you OK compression but no power from the cylinder as no actual flow to or from it. A few days ago I was cleaning up a stock of old Ford 1500 cams that I keep for spare layshafts and noticed one had one lobe that was almost circular it had so much wear but the other 7 lobes were fine...

After that I am out of ideas
In the end it may just be cooler because its in the front and gets more cooling air?.

cheers
Rohan
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PostPost by: Elanconvert » Wed Jun 25, 2014 7:59 am

hi rohan ...thanks for the input...
fan is not involved as none fitted [yet]...
there is a good spark at no.1, tappet clearances are fine, etc..
my first thought was timing issues, but that would presumably affect all four cylinders, not one or three..
..[I have mislaid my strobe light... :evil: or did I loan it to someone?.......memory's going as well :( ]
interesting observation on cam lobes, though........I will check pushrod travel.....

:D fred
'Never give up!....unless it's hopeless.....'

1970 S4 dhc big valve
1973 Ginetta G15
1967 Ginetta G4 [sadly now sold]
1959 lotus elite type 14
Elanconvert
Third Gear
Third Gear
 
Posts: 429
Joined: 26 Jul 2013
Location: Sunny Devon, United Kingdom

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