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06-10-2016, 08:19 PM | #1 |
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Re: Pinging after 40-45 mins of driving?
Also if your engine is running lean it will get hot and ping.
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Evan - 1969 C10 LWB fltsd 307 3spd man.steer 3.73 rear orig.white/turquoise poly with drk turquoise int - 1972 Custom Deluxe10 LWB fltsd 350/TH350 pwr. steer/brks A/C 3.07posi rr orig.med blue with blue cloth trim. |
06-10-2016, 09:27 PM | #2 |
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Re: Pinging after 40-45 mins of driving?
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06-10-2016, 09:32 PM | #3 |
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Re: Pinging after 40-45 mins of driving?
This has got me wondering a little, because about a month ago I was fiddle fartin around with the truck and had the carb off. When I put it back on, I BARELY over tightened the passenger rear bolt (didn't get carb studs like I shoulda) and the corner cracked but stayed on, so I left it alone. The crack goes all the way through for sure, but I don't know if it's causing a vacuum leak.
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06-10-2016, 07:21 AM | #4 |
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Re: Pinging after 40-45 mins of driving?
Been there and ended up buying a programmable MSD box with a small body distributer. That made life much easier and kept the distributer phasing correct.
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06-10-2016, 12:28 PM | #5 |
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Re: Pinging after 40-45 mins of driving?
Have you considered that there might be carbon build-up in your combustion chamber that is increasing your compression ratio? Additionally, that carbon can act like an ignition source for fuel when it gets red hot. The increased compression ratio and ignition source from the carbon can cause pinging and/or detonation. I recommend running a good quality top end cleaner, ATF, or water through your carb to clear out any carbon, and take this possibility out of the equation before you do anything else.
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06-10-2016, 01:37 PM | #6 | |
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Re: Pinging after 40-45 mins of driving?
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06-10-2016, 02:41 PM | #7 |
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Re: Pinging after 40-45 mins of driving?
I had a fresh motor that got a quick carbon build up when I used some valve covers that didn't have good oil baffles. My PCV valve was able to suck in enough oil to create a nice carbon crust in just a few weeks. Just saying its possible. I ended up going the water route to clear out the carbon, and then put on another set of valve covers with good oil baffles. No problems since.
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06-10-2016, 01:49 PM | #8 |
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Re: Pinging after 40-45 mins of driving?
Basically you get the motor up to temp then raise the RPMs up. From there either dribble water out of a bottle through the carb or use a spray bottle and mist it into the carb. The RPMs will drop off so don't let it stall. It will literally steam clean the piston tops and combustion chambers. This is an old racer trick but be careful as to much water to fast and bad things happen. You can hydro lock the motor if you go nuts. Going slow you can put gallons off water through the carb but it really only takes a 20oz coke bottle to get the job done.
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06-10-2016, 03:57 PM | #9 | |
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Re: Pinging after 40-45 mins of driving?
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06-10-2016, 03:58 PM | #10 |
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Re: Pinging after 40-45 mins of driving?
I felt the fuel filter today as well just to see and it was scalding hot, any thoughts on that?
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06-10-2016, 08:45 PM | #11 |
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Re: Pinging after 40-45 mins of driving?
I'll say one last time because I don't want to be a dork about it, but if you've got manifold vacuum connected to vacuum advance, that's your cause. You've got a bunch of initial timing and then soon as you foot-brake it, which won't take manifold vacuum very low at all, you've got vacuum+initial == detonation.
Before you start pouring water into your engine or other last-ditch attempts, put it back the way GM built it (if it's not). In brief: big cams like lots of timing so people "discover" that they idle better with manifold vacuum on the vacuum can, but you can't drive it because it'll rattle like crazy with detonation. Don't do that (if you are). I could go into a giant manifesto about vacuum advance, how it works, and so on, but I'll leave it at "Hook it up like GM did".
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06-10-2016, 09:25 PM | #12 | |
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Re: Pinging after 40-45 mins of driving?
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06-10-2016, 09:33 PM | #13 |
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Re: Pinging after 40-45 mins of driving?
The picture is sideways...but you can still see the crack
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06-10-2016, 09:53 PM | #14 |
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Re: Pinging after 40-45 mins of driving?
DUDE , and I mean this in a nice way , toss that carb you killed it . That's a huge vacuum leak , and the pretty chrome and glass fuel filter is the absolute worst filter ever made ,Toss that in the trash along with the carb and get a plain old steel filter ! Before your standing back and watching it go up in flames !! Take all the performance books and threads you've been reading and toss those too !! Back it all down and drive the truck . Your tossing $100.00 bills at it weekly and getting no where . Carbs don't have to torqued down that hard . And trying to get that engine where you want to be isn't going to happen .enjoy it for what it is ,don't drive yourself INSANE trying to make it something it's not . Hug the kid and take your girl out for dinner and walk away from it for a few days .
And dump that carb spacer and get studs and a phenolic spacer .
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1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop Last edited by Grumpy old man; 06-10-2016 at 10:04 PM. |
06-10-2016, 11:06 PM | #15 | |
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Re: Pinging after 40-45 mins of driving?
Quote:
These posts always crack me up lol I haven't spent a dime on this thing for a while, and yesterday is the first time I've touched it in weeks because I've been working and doing the family thing. I will get a new filter though and a nice shiney polished oversized carb and then I'll install it using my David Vizard performance books Bwahahaha! Just ribbin ya |
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06-10-2016, 11:27 PM | #16 |
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Re: Pinging after 40-45 mins of driving?
Lots of online mechanics have never touched a wrench , send their truck out to be worked on and can tell you everything you ever wanted to know about building engines according to whatever book their reading at the moment ! I used to chuckle when I'd over hear a new owner brag about the new truck he brought to a show and how long he worked on it when all he did was sign the check and hand it to me ! Put a Pontiac quadrajet on it 850 CFM and it will run just fine. I wish you lived closer for 2 reasons , 1 being you would be buying me a LOT of Heineken , and 2 I'd love to see your face when a little 292 smokes your big old bad V8 . Bhwaaaa .... Bhwaaaa...Bhwaaaa .....and gone !
Weight and balance ....Weight and balance ............100 ft burnouts are easy in any truck , getting one to launch correctly with 75 % of the weight in front is a whole nother ball game
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1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop Last edited by Grumpy old man; 06-10-2016 at 11:33 PM. |
06-11-2016, 12:52 AM | #17 | |
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Re: Pinging after 40-45 mins of driving?
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06-10-2016, 11:24 PM | #18 |
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Re: Pinging after 40-45 mins of driving?
Finding a vacuum leak is great, but the problem I'm having is with pinging and detonation. So does a vac leak cause that to happen??
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06-11-2016, 12:52 AM | #19 |
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Re: Pinging after 40-45 mins of driving?
So can a vacuum leak cause pinging or detonation?
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06-11-2016, 11:26 AM | #20 |
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Re: Pinging after 40-45 mins of driving?
One thing at a time. That broken carb is an issue for sure so fix that first.
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06-11-2016, 01:50 PM | #21 |
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Re: Pinging after 40-45 mins of driving?
Yes, a vacuum leak could make it worse, but it's a problem that needs to be fixed on its own. I prefer carb studs (vs bolts) and then use a torque wrench. Easy to break carb corners and thermostat housings.
I'd wager that fixing the carb and the vacuum line routing together will go a long way.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
06-11-2016, 02:23 PM | #22 | |
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Re: Pinging after 40-45 mins of driving?
Quote:
SO, I don't want to buy two carbs, but I want my truck to run and drive during the buildup of the 383. So I need to get a carb that will feed the 383 later, and also run decent on the current motor. I actually posted about this situation a couple days ago, I'm looking at the Holley 750 Street HP. |
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06-11-2016, 02:04 PM | #23 |
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Re: Pinging after 40-45 mins of driving?
boiling the fuel will make it run lean. if your true compression ratio is over 10/1 then with cast iron heads your gonna have to run more octane. Get used to it if your gonna boost a small block!
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06-11-2016, 02:35 PM | #24 |
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Re: Pinging after 40-45 mins of driving?
I tried a few different calculators and got 10.4-1 every time. Maybe a little high for cast iron heads It costs about 60 bucks for me to fill up with premium 91 at the pump, and it's 65 bucks for a 5 gallon can of Sunoco 110. I THINK that adds up to about 96 octane ( 14gals of 91 + 5gals of 110 ). I might just start goin to the little airport in town and fill up with 99 or 103 for 6 bucks a gallon.
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06-11-2016, 03:15 PM | #25 |
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Re: Pinging after 40-45 mins of driving?
Airports don't sell fuel to car / truck owners it's illegal and they only carry 100 LL - low lead and"jet fuel is only kerosene so your not using that . I don't understand why you can't see you should park it until the carb and filter issue is fixed? It's broke don't drive it ! From day one I told you those heads were not worth the time and yet you continue to try to make them work ? There is a reason they had bad reviews .we used to run 12.5 : 1 engines on pump gas advanced timing and hot gas won't fix your problems , your melting spark plugs ? Did I read that right ?
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1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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