Boosted Beaumont Build - Page 5 - Chevelle Tech
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post #61 of 75 (permalink) Old Jul 2nd, 19, 11:16 PM Thread Starter
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Chris
 
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Re: Boosted Beaumont Build

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Originally Posted by -SS454- View Post
Way to go! Driving the whole trip is a success by itself. What kind of MPH did you manage?

Did you drive the whole trip on the drag radials?
MPH at the track... best time was a 12.182 @ 119.75mph. Clearly that doesn't add up for the setup, I got some work to do. This pass was in Bandimere, track elevation 5800ft. With that MPH it should be a low 11 pass for sure. turns out after reviewing some data logs I was only pulling 26degrees total timing, should really be at 36 and retard whatever I need for boost. might explain the lack of performance heh.


No I bought a set of cooper cobra tires for the drive down. The drag radials, jack, stands, a lot of tools, and spare parts were in the trunk. sometime soon I am going to build a tire rack carrier for the back of the car. It will free up a ton of room in the trunk. Will be a quick release system that will mount off the bumper or mayby even the frame if I can figure a way of hiding all the brackets and what not, some minor brain storming to complete.

1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
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post #62 of 75 (permalink) Old Jul 7th, 19, 12:46 PM Thread Starter
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And... boom...

Figured out my lack of boost problem. Unfortunately at 12-15psi boost I am sure this was well over 8-850hp which exceeded the current fuel system, caused some detonation, and a connecting rod let go. Almost looks like 2 rods. Should have it put later today sometime.

Don’t ask if I am doing a LS conversion, the big block stays!

Hopefully finding $5 right we’re I stopped is a good fortune 😉
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1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
post #63 of 75 (permalink) Old Jul 7th, 19, 4:10 PM
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Re: Boosted Beaumont Build

Quote:
Originally Posted by GoFast Beaumont View Post
And... boom...

Figured out my lack of boost problem. Unfortunately at 12-15psi boost I am sure this was well over 8-850hp which exceeded the current fuel system, caused some detonation, and a connecting rod let go. Almost looks like 2 rods. Should have it put later today sometime.

Donít ask if I am doing a LS conversion, the big block stays!

Hopefully finding $5 right weíre I stopped is a good fortune 😉
That last pic is an ugly sight,showing through like that. Hopefully the damage is minimal

John
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post #64 of 75 (permalink) Old Jul 7th, 19, 7:52 PM Thread Starter
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So short block is a write off.

Some chunks missing out the cylinder walls, 4 morel hyd lifters, cam broke in 3 places, timing set kicks out the from cover, broken rod, broken piston.

Checked the data log and was running 14.5psi on boost. Looking and fuel pressure and injector duty cycle, there just wasn’t enough fuel for the beast. An error on my part that will be address in the future, triple pump assembly going in!

So I am looking at options. Suggestions are appreciated. Right now think either build a 454ish motor or call someone for a short block already built

I’d imagine at 14.5psi, and with a base HP level over just over 600, it was just over 1000hp for a short duration. At least I got sometime to prep for Raceweek 2020!
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1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
post #65 of 75 (permalink) Old Jul 9th, 19, 12:32 PM
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Re: Boosted Beaumont Build

That sucks! I'm sure it was fun for the few seconds before it let go. Are the 502's cast pistons? Part of a connecting rod with a wrist pin laying in the pan seems to indicate a piston let go first.

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post #66 of 75 (permalink) Old Jul 9th, 19, 12:40 PM
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Re: Boosted Beaumont Build

That's a bad one for sure.

What fuel pumps have you been running? Shouldn't be a need for 3 pumps, I wouldn't think.

1971 Chevelle SS454, T56 Magnum 6 speed, 3.31 Posi

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post #67 of 75 (permalink) Old Jul 9th, 19, 1:05 PM
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Boost referenced fuel pressure regulator with flow capable of the HP you will be at.

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post #68 of 75 (permalink) Old Jul 9th, 19, 7:26 PM Thread Starter
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Quote:
Originally Posted by Chris27 View Post
That sucks! I'm sure it was fun for the few seconds before it let go. Are the 502's cast pistons? Part of a connecting rod with a wrist pin laying in the pan seems to indicate a piston let go first.
They are forged pistons on pressed rods. The pressed pin actually shift in the rod. I’d imagine with the deto kicking in it blew the bottom out of the pin and then the rod broke as collateral damage.

Piston very lightly hit the head, more or less knocked the carbon on.

1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
post #69 of 75 (permalink) Old Jul 9th, 19, 7:30 PM Thread Starter
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Quote:
Originally Posted by -SS454- View Post
That's a bad one for sure.

What fuel pumps have you been running? Shouldn't be a need for 3 pumps, I wouldn't think.
It is just a single 340 pump in the tank. These pumps can support up to 800hp. Have used single 340’s in multiply 700hp builds. As noted it was a error on my end setting boost levels and there just wasn’t enough to feed the beat.

The reason for the triple idea is to run 3-240 pumps, when long hauling with power it is easily to replace parts that are commonly available. 240 pumps are a dime a dozen in parts stores, 340 pumps are a lot harder to come by.

With the sniper I can stage the fuel pumps in as I need them for power demands. So run around town and down the road on 1 pump and as power comes on you can turn the other on as needed.

1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
post #70 of 75 (permalink) Old Jul 9th, 19, 7:33 PM Thread Starter
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Quote:
Originally Posted by LevonH View Post
Boost referenced fuel pressure regulator with flow capable of the HP you will be at.
I run one and It is a must 😉
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1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
post #71 of 75 (permalink) Old Jul 9th, 19, 11:24 PM
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Chris
 
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Re: Boosted Beaumont Build

Quote:
Originally Posted by GoFast Beaumont View Post
It is just a single 340 pump in the tank. These pumps can support up to 800hp. Have used single 340ís in multiply 700hp builds. As noted it was a error on my end setting boost levels and there just wasnít enough to feed the beat.

The reason for the triple idea is to run 3-240 pumps, when long hauling with power it is easily to replace parts that are commonly available. 240 pumps are a dime a dozen in parts stores, 340 pumps are a lot harder to come by.

With the sniper I can stage the fuel pumps in as I need them for power demands. So run around town and down the road on 1 pump and as power comes on you can turn the other on as needed.
Check the Performance World 340 lph pumps you can find at Mopac. If my pump ever goes, that's what I'm doing.

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post #72 of 75 (permalink) Old Jul 10th, 19, 8:13 AM Thread Starter
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Quote:
Originally Posted by -SS454- View Post
Quote:
Originally Posted by GoFast Beaumont View Post
It is just a single 340 pump in the tank. These pumps can support up to 800hp. Have used single 340’s in multiply 700hp builds. As noted it was a error on my end setting boost levels and there just wasn’t enough to feed the beat.

The reason for the triple idea is to run 3-240 pumps, when long hauling with power it is easily to replace parts that are commonly available. 240 pumps are a dime a dozen in parts stores, 340 pumps are a lot harder to come by.

With the sniper I can stage the fuel pumps in as I need them for power demands. So run around town and down the road on 1 pump and as power comes on you can turn the other on as needed.
Check the Performance World 340 lph pumps you can find at Mopac. If my pump ever goes, that's what I'm doing.
That’s what I am currently running. Worked great on my NA setup.

My intuition is that these PW pumps are a little weak compared to Aeromotive but you can’t beat them for the price.

1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
post #73 of 75 (permalink) Old Jul 10th, 19, 8:21 AM Thread Starter
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So got the heads off.

Pressed pin was moving in the piston, detonation.

#1 cylinder is the one that let go only, I though #2 did as well. Piston is jammed in the bore.

3 valves are bent on the heads. Luckily AFR still makes the valves so I can just replace the 3. Will need to rebuild the guides and mayby the seats for the heads. Bent valves are somewhat expects as the cam is broke into 3.

****ty part... phoned up Straub for replacement lifters, I guess Morel dropped the dog bone style lifters. I will need to find a couple or figure something else out. This will be the last time I buy a specialized part like this. I need 4 lifters.

All the remainder pistons look to be in great shape. A bit of carbon build up but that is somewhat expected for a motor with 2000hrs or more on it. Zero cross hatch left in the bore.

Try a do some more break down later tonight.
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1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
post #74 of 75 (permalink) Old Jul 10th, 19, 5:50 PM
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Re: Boosted Beaumont Build

Quote:
Originally Posted by GoFast Beaumont View Post
Thatís what I am currently running. Worked great on my NA setup.

My intuition is that these PW pumps are a little weak compared to Aeromotive but you canít beat them for the price.
I think its the same pump with a different badge on it. I know for sure my Ricks Tank pump is made in the same factory as the Aeromotive ones. And it looks the same as the PW one. I don't know what kind of hat you have on your tank, but mine is designed so I can run dual pumps. I think 2 340's would be the way to go. Smallest I'd do is 2 -8 lines feeding Y fitting to single -10 to the front of the car. I would go 2 -10s to single -12 so you don't have to redo it if you decide you want to push 1200 hp.

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post #75 of 75 (permalink) Old Jul 14th, 19, 12:29 AM Thread Starter
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Finally got the pistons out. 2 were a challenge for sure. Looks like 3 bent valves. Here’s a couple pictures of the piston that got chewed up.

As for the crank it looks ok. Couple small dents in the counterweights. The front side of the counterweights are coated with aluminum. Next step is to check the runout on the crank and see if it’s bent. If not send it out to check for cracks and phasing, it looks pretty good overall. No scoring on surfaces.
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1968 Beaumont
502 big block
Stock looking, definitely not stock sounding
HP and ET not determined yet!
GoFast Beaumont is offline  
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