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  #16 (permalink)  
Old 03-20-2014, 08:32 AM
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We do not know the specs of the hydraulic cam and didn't not put it in. We have taken the valve cover off and made sure they all are rocking the right way. There wasn't any broken springs or anything that looked out of place.


Would a higher octane gas such as 103 or 110 possible help this problem ? If so would 100LL or Aviation gas work, or should I just stay away from that stuff

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  #17 (permalink)  
Old 03-20-2014, 12:22 PM
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Well if available and you have deep pockets then that hi test fuel cant hurt but seems to me the better route would be to keep on trying to determine the root cause of the issue.

When you say that things are getting worse that to me suggests that there are deeper factors at play here.

If it is timing >>> then start with basics, determine true TDC, verify the timing marks and tab are accurate, set the timing down to 10 deg base BTDC at idle, rev it up to 4000 rpm to determine that the total advance is less than 30 deg BTDC, disconnect the vacuum advance if you have it. Try crusing it around under light load and if it still rattles then chances are you have something else other than "pinging" going on, it goes away then stay focused on the distributor curve and the ignition in general. As mentioned before in other posts make sure that the A/F ratio is correct, no intake port gasket leaks and that the carb is not too lean.
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  #18 (permalink)  
Old 03-20-2014, 12:28 PM
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Quote:
Originally Posted by 383z View Post
im sorry it has taken this long to reply i posted this right before i went into work yesterday and have not been on since then.

my brother and i do not know much about the motor besides it has 70cc aluminum heads, flat top pistons, 383 bottom end, holly 750 ultra hp double pumper carb, victor jr. intake, the cam size/piston size and compression ratio is unknown. it has a th350 trans and around 4.10 gears.

its hard to describe the problem besides the pinging noise coming out the passenger side is getting worse and the timing doesn't effect it

i have put 93 octane in it every time but i think the person who we got the motor from used something higher because he used it for the strip only, where im trying to make it a street/ strip car. The person we got it from said it would run on 93 so i trusted his word.

on the highway cruising at about 55 the temp slowly grew hot to about 210-220ish and then staid there. it has seemed to be a little sluggish all around at acceleration. when it starts up after idleing for 3-5 mins it seems like it still wants to die once put in gear but down a street or two that goes away.

thank you all again for any advice given
Ayuh,.... We see detonation alot in boat motors, usually brought on by bad fuel, or water in the fuel,...

Because yer only seein' it in 1 side of the motor,...
I'm gonna guess 1/2 of yer carb is plugged up/ restricted,...

I donno yer intake, but if it's a dual plane, 1 side of the carb feeds one side of the motor,...
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Old 03-20-2014, 04:28 PM
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I donno yer intake, but if it's a dual plane, 1 side of the carb feeds one side of the motor,...
With a single-plane intake, all cylinders are seen by all venturis at the same time, but with a dual-plane, one side of the carburetor feeds 2 cylinders on each side of the motor for a total feed of 4 cylinders..... 2, 3, 5 and 8 are fed by one side of the carb and 1, 4, 6 and 7 are fed by the other side of the carb. Run the firing order of 1-8-4-3-6-5-7-2 through your mind and you can see where the cylinders alternate from one feed to the other.
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Old 03-21-2014, 08:27 AM
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av gas

Quote:
Originally Posted by 383z View Post
We do not know the specs of the hydraulic cam and didn't not put it in. We have taken the valve cover off and made sure they all are rocking the right way. There wasn't any broken springs or anything that looked out of place.


Would a higher octane gas such as 103 or 110 possible help this problem ? If so would 100LL or Aviation gas work, or should I just stay away from that stuff
poor selection for street use.Airplane plugs get cleaned every 50 hours of flight time.I flew my plane about 65 hours with out cleaning and had 2 plugs foul on take off.
try it as a "test" only.
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Old 03-21-2014, 01:14 PM
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Originally Posted by vinniekq2 View Post
poor selection for street use.Airplane plugs get cleaned every 50 hours of flight time.I flew my plane about 65 hours with out cleaning and had 2 plugs foul on take off.
try it as a "test" only.
The dirty underwear test!???

Bogie
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  #22 (permalink)  
Old 03-21-2014, 09:06 PM
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cheap test results

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The dirty underwear test!???

Bogie
That made my day,roflmao
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Old 03-22-2014, 05:37 AM
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Originally Posted by vinniekq2 View Post
poor selection for street use.Airplane plugs get cleaned every 50 hours of flight time.I flew my plane about 65 hours with out cleaning and had 2 plugs foul on take off.
try it as a "test" only.
Were those two plugs in the same cylinder? That would be a pucker moment for certain!
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  #24 (permalink)  
Old 03-22-2014, 09:25 AM
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cessna plugs

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Were those two plugs in the same cylinder? That would be a pucker moment for certain!
yes,both plugs in the same jug. During run up there was not a problem.100' feet up near the end of the runway down 25% power,,,,2 passengers(friend and my oldest son)
BTW the fuel is blue
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Old 03-22-2014, 09:45 AM
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Quote:
Originally Posted by vinniekq2 View Post
poor selection for street use.Airplane plugs get cleaned every 50 hours of flight time.I flew my plane about 65 hours with out cleaning and had 2 plugs foul on take off.
try it as a "test" only.
You have your own airplane? Wow. That's pretty cool. Not many can say that. Do you have a thread somewhere here on it? (I don't want go way off topic in the thread). If not, you should.
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