Rear window out.

Mad4slalom

Mad4slalom

Well-known user
Morning all, went for an early run out for breakfast today, Tops off , after we left the cafe the sun had warmed up so took out the rear window, love that bit of extra v8 noise. Noticed a ford group meeting at the royal cornwall showground , several mk1/2 escorts and mustangs , a cougar and a cobra so wandered around there for an hour then took the long way home as usualšŸ‘ anybody else remove their rear window on 68-72ā€™s ? Is it normal to get a bit more exhaust gas pull back in to the cabin? I wondered ifmine is running a bit rich ? No choke and double pumper holley so obviously smells a bit rich after 4/5 pumps to fire her up. Any thoughts or comparisons ?
Thanks in advance , enjoy all this sunny vetting weather šŸ‘IMG_9910.jpeg
 
Roscobbc

Roscobbc

Moderator
Tops are off, windows down and rear window out as soon as warmer weather and sun dictate with my C3. And they remain so all summer unless I get caught-out somewhere and it rains. I never, ever get a sniff of exhaust fumes in the car..... However primary jetting is set-up well. Secondaries are set-up richer, but no smell in car even if in a group of other Vette owners, er', 'pressing-on' with plenty of WOT and accelerator pump action. However others closely following have commented about the smell of high octane exhaust fumes following me in those scenarios.
I would check for an exhaust leak under the hood. Removing roofs etc may be drawing these fumes into the passenger compartment through the cabin/heater vents or poorly sealed firewall?
 
Mad4slalom

Mad4slalom

Well-known user
Roscobbc said:
Tops are off, windows down and rear window out as soon as warmer weather and sun dictate with my C3. And they remain so all summer unless I get caught-out somewhere and it rains. I never, ever get a sniff of exhaust fumes in the car..... However primary jetting is set-up well. Secondaries are set-up richer, but no smell in car even if in a group of other Vette owners, er', 'pressing-on' with plenty of WOT and accelerator pump action. However others closely following have commented about the smell of high octane exhaust fumes following me in those scenarios.
I would check for an exhaust leak under the hood. Removing roofs etc may be drawing these fumes into the passenger compartment through the cabin/heater vents or poorly sealed firewall?
Click to expand...
Have never noticed any exhaust smell under the hood when engine running. Or in the cabin. I will try astro vents in various positions to see if that makes any difference. Will have to find a holley guy locally and get my carb settings checked.
Thank you šŸ‘
 
CaptainK

CaptainK

CCCUK Member
I would love to take the rear window out on my 68. Alas, Bubba sealed it in place before my ownership and I still haven't gotten around to fixing it.
 
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Nassau65

Nassau65

CCCUK Member
Yes, the T-Top certainly made the corvette appealing/practical for many people and certainly became most popular. But nothing IMHO beats a convertible.
 
Roscobbc

Roscobbc

Moderator
Nassau65 said:
Yes, the T-Top certainly made the corvette appealing/practical for many people and certainly became most popular. But nothing IMHO beats a convertible.
Click to expand...
Thing is........when driving a T top (sans rear window and tops) you're not actually aware of the remaining structure.....
 
Nassau65

Nassau65

CCCUK Member
Often wondered what a C2 coupe would look like with T-Tops? Never seen one done and Iā€™ve been to lots of corvette shows stateside. Iā€™m quite sure someone has done one somewhere in the US, especially during the custom craze of the 70ā€™s
 
Roscobbc

Roscobbc

Moderator
not quite.......
004-1963-Corvette-Solar-Flare-build-Bertelsen-fiberglass.jpg
 
Roscobbc

Roscobbc

Moderator
In my eyes it doesn't quite work - rear sloping butresses arguably look too heavy and need to be a little 'slimmer', perhaps tapering down to the rear deck with a gentle concave curve to blend with the opposite and convex curving of the rear end.
 
Roscobbc

Roscobbc

Moderator
I reall some years back a buddy had an AC Cobra replica with a severely 'cammed' stroker 514 cu in big block Ford engine. He was 'running' a rather silly Holley Dominator race carb too. We took a trip (with me in the Vette following him) at 50 mph or so speeds to the local car meet - perhaps 15 miles distance. His car was running so rich that when we got to the meet his eyes were bloodshot from the intensely rich mixture in the cabin. Anyone who has travelled in a Cobra cabin will be well aware that unlike a Vette you get blown to pieces by the poor areodynamics and back-draught from the side exhausts circulating excess exhaust fumes in the cabin. Me? - I learnt within a few hundred yards of following him about the exhaust fumes and dropped right back.......but even so my eyes were still red from inhaling the fumes when I got to the meet.
Mad4 - It isn't difficult to tune a Holley without resorting to using probes rammed up your tailpipe. Simply put a new set of plugs in the engine (or super cleaned ones) - once the engines warmed-up and off-choke go for a steady 50 mph cruise for a few miles - cut the ignition/engine off - knock it into neutral - and coast to a standstill (ideally in a pre-planned layby) - remove the plugs and note the condition of each one and its position in the engine. Perhaps do the same thing in urban/town use (and again try and record the colour of plugs) - do the same thing yet again at wide open throttle - obviously you'll have far less less time to do this (do it in an intermediate ratio if you have to) but the colour of the plugs should tell you if the fueling is correct. The first two tests should tell you if primary main jets are sized correctly. The third test if secondary main jets are correctly sized. If there are underlying mechanical issues with the engine these should show too.
 
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