NSW Corvettes
Technical Tips => Pre 84 => Topic started by: Lefty on August 14, 2013, 07:47:17 PM
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Hi,
Just a quick one. I was searching for a previous answer to this question but could not find in the forum. I have a 1979 vet, 350 engine.
What type of petrol does everyone use. I was using 98 and was advised 95 would be better for the motor and there wasn't a noticeable difference in performance. Are there any other opinions?
Cheers Lefty :what: :what: :what: :what: :what: :what: :what:
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Iuse 98, but not Shell fuel my car goes onto 7 cylinders. Other members have had the same problem.
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I concur. The Shell fuel seems to create havoc with carby fed engines. I'm no fuel expert but I would say in depends on the compression of your engine. My Vette runs 11:1 compression and a bit of a cam. I have run it on 95 when I've had no choice but If I get into it it will ping it's head off. I would guess that if you motor is a lower compression unit it would be ok on 95.
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I was reading the for mum post http://nswcorvettes.com.au/forum/index.php/topic,3450.msg1045912742.html#msg1045912742 (http://nswcorvettes.com.au/forum/index.php/topic,3450.msg1045912742.html#msg1045912742)
Which I think was one of yours cam, from BP. This was interesting, the recent issue I had with the hesitation could be put down to using 98.
I wonder if there is a fuel supplier out there who provides suitable fuel for our engines?
Lefty
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I use Caltex 98 in my 454. The previous owner warned me against using Shell V-Power as the engine definitely doesn't like it.
I've heard some reports of Vette engines running a tad hot when using 95.
If the engine is in good condition and good tune, then you should get better economy on 98 than 95.
(Economy is not something I bother about. I use a tankful on a day out anyway LOL!)
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Yep that's one of mine from the early days. I did a bit of testing when we did the new motor in Priscilla. Took samples at different stations as well as tried them in the car. I found I had problems with BP and more so with Shell but no hassals with Mobile and Caltex 98's. I also found quite different fuels at different stations. Yeah yeah I know I'm anal, but had too much money wrapped up in the motor. I settled on a station in my area which has a good turn over in fuel and it's fuel is always nice and clean. A Caltex. When out of town I always try to use Caltex or Mobile.
......(Economy is not something I bother about. I use a tankful on a day out anyway LOL!)
:thumb:
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Lefty, just read your post on your hesitation issue. Just a thought, if you now have new hotter plugs and she's running ok you should periodically pull a couple to see how they are running. It's a good indication of how your motor is running and you can pick up potential problems well before they get too bad. Once all is ok you wont have to worry until service time.
You burning any oil?
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Thanks cam, that is good advice and the plan going forward. It's been a learning process and just a few basics I think are good starting points,
Check plugs and replace if in doubt,
Use fresh petrol and determine the best one for the car,
When you get the car converted or the power steering pump changed, change the plugs that will be inaccessible during this process,
Drive the car and check plugs until it is tuned to run well.
If you can't diagnose or tune, make sure you have someone who can.
Lefty
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RE the oil, it does not appear to be burning oil just leaking it from the back of the engine, have fixed most leaks this is should be the last one. ( do corvette ever stop leaking?)
Cheers
Lefty
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Yep they do stop leaking, when the oil runs out :lol:
Rear of the motor.... rear main possibly, that's no fun. But check the back of the valley cover (intake manifold) dissy where it fits into the block and of course the back of the tappet covers. Access to a car hoist really helps. What area do you live in?
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Yep they do stop leaking, when the oil runs out :lol:
Rear of the motor.... rear main possibly, that's no fun. But check the back of the valley cover (intake manifold) dissy where it fits into the block and of course the back of the tappet covers. Access to a car hoist really helps. What area do you live in?
Good advice
If oil is coming from high in the motor your in luck
In two piece rear min seals you can chance with crank in place
But not easy
It involves lowering th crank and rotating the top half seal
If its a rope seal crank out job
Bfit
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If he drops the inspection cover on the bell housing he'll soon know if it's the rear seal or not.
Always pays to give the motor a good clean when chasing oil leaks. Brake cleaner works a treat. Don't have to wash the motor with water and it drys really quickly. NOT to be done on a hot motor.
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Cam.
The oil leak hits the top of the exhaust just in front of the driver ( note rod conversion), ill investigate and see what it looks like. There are few bits to fix and ill get to them soon.
Many thanks
Lefty
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Cam.
The oil leak hits the top of the exhaust just in front of the driver ( note rod conversion), ill investigate and see what it looks like. There are few bits to fix and ill get to them soon.
Many thanks
Lefty
Mate on some cars there is a oil line that comes from the Block just above he filter worth a look at if your engine has it
Bfit
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Cam.
The oil leak hits the top of the exhaust just in front of the driver ( note rod conversion), ill investigate and see what it looks like. There are few bits to fix and ill get to them soon.
Many thanks
Lefty
What area you live in Lefty? I only ask as I have a hoist that you are more than welcome to put your beast up on to have a look underneath, if you already don't have access to one.
The hoist is at Ingleburn.
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Many thanks cam that's a very kind offer, in at Croydon. I may just take your on this if I can't determine the issue.
Many thanks
Lefty
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No probs. I'm retired so pretty well free most days, if I'm not out cruising.
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I went to the carby centre in Burwood and the guy told me to run it on 95, he said 98 is best for modern motors with fuel injection, etc.
Then you get it tuned with 95 in the tank, if you don't have an octane sensor it won't adjust when you change it to 98.
Someone else told me valve lube additive makes it run smoother even though he has hardened seats.
s
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Steven,
Do you favour a particular brand of petrol?
Lefty
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Steven,
Do you favour a particular brand of petrol?
Lefty
I usually go to Caltex or Shell due to shopper dockets, lol.
I can't really spot a difference between the two and haven't had the issues other people have with fouling plugs, etc. I don't use 98 so not sure if that has something to do with it.
Online I hear differing accounts and it depends on which region you get your fuel from as to which one is better.
I only hear good reports about BP Ultimate though.
Edit: I also use the Nulon valve lube.
s
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in at Croydon
If you're having issues with hesitation it could be your carb.
If you're in Croydon you're real close to
http://www.carburettorservice.com.au/ (http://www.carburettorservice.com.au/)
perhaps drop by and get him to check it out?
s
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Steve,
RE post 17, I did go to BURWOOD and the guys changed the plugs and tuned the carbie. Also got the same advice as you RE 98 vs 95, and manufacturers. Ill take this on board and see on the next few drive what changing fuels and supplier makes.
Many thanks
Lefty
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Hi,
First run sine last post. I ran Caltex 95, to start with all went well, no pinging.
But after 50ks there was significant hesitation.
With the plug replaced and the carbie serviced recently, its time to address the magneto. Ill try the guys at Arncliffe and see if they can help.
I'm thinking this will be an awesome car once this is resolved.
Many thanks for the advice.
Lefty
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Thread split after much fun. Posts that were here are now here http://nswcorvettes.com.au/forum/index.php/topic,9957.0.html (http://nswcorvettes.com.au/forum/index.php/topic,9957.0.html)