What would you do if your motor was built like this?

Krooser · Post by **Krooser** » Tue Nov 19, 2019 12:02 pm

Got a buddy who crews on his nephews Sprint car team.

This past season they struggled with their SBC not performing up to snuff.

They took it to another builder and look what they found...ouch.

Dan Timberlake · Post by **Dan Timberlake** » Tue Nov 19, 2019 12:14 pm

Did it pull to the left under hard acceleration?

Steve.k · Post by **Steve.k** » Tue Nov 19, 2019 12:26 pm

Had the valve clearance set tight at least.

BlitzA64 · Post by **BlitzA64** » Tue Nov 19, 2019 12:43 pm

I bought one from a "Friend" a couple years ago, damn near the same thing. "Dyno tuned" as well. Luckily I caught it before ever using it when I decided to do a leak down and it was like it had no valves at all

turbo camino · Post by **turbo camino** » Tue Nov 19, 2019 1:25 pm

edit: unrelated

Post by **Dave Koehler** » Tue Nov 19, 2019 1:50 pm

ehhhh, while humorous I don't think those 2 photos are related.

Post by **Dave Koehler** » Tue Nov 19, 2019 1:54 pm

Krooser wrote: ↑Tue Nov 19, 2019 12:02 pm Got a buddy who crews on his nephews Sprint car team.

This past season they struggled with their SBC not performing up to snuff.

They took it to another builder and look what they found...ouch.

Some people really go to extremes so as not have to rebalance.

Krooser · Post by **Krooser** » Tue Nov 19, 2019 2:00 pm

They have a hunch the last guy to touch it took their good heads and installed similar but different heads. Big name northeast builder.

Curtis Mc · Post by **Curtis Mc** » Tue Nov 19, 2019 2:38 pm

Here is a "way out there" theory - what if those pistons were in holes where the crew chief knew they may get pumped? It's been known to happen...

novafornow · Post by **novafornow** » Tue Nov 19, 2019 2:42 pm

Raise hell. Not sure what can be proved legally since it was run, but make some noise about the shop to help the next guy.

lefty o · Post by **lefty o** » Tue Nov 19, 2019 3:22 pm

if those arent the pistons that were supplied to the engine builder, and they have suspicion he swapped heads, well i have a short temper and id probably knock the guys teeth out.

Post by **Dave Koehler** » Tue Nov 19, 2019 3:35 pm

Since it's a sprint car it must be MFI. Add some nitro but increase the nozzle size on the flat top holes by 10%.

I like the pump checked theory.

dannobee · Post by **dannobee** » Tue Nov 19, 2019 3:36 pm

Curtis Mc wrote: ↑Tue Nov 19, 2019 2:38 pm Here is a "way out there" theory - what if those pistons were in holes where the crew chief knew they may get pumped? It's been known to happen...

I've known "some" people who would do that, along with some strategically located roll bar tubes to "help" the official choose certain cylinders.

Krooser · Post by **Krooser** » Tue Nov 19, 2019 9:56 pm

410 sprint on mechanical injection. No compression rules.

The engine rev'd effortlessly last season... this year it choked down to 8200-8400. It was their long track motor but could not keep up this year.

I guess I'd be sitting in front of their shop the morning after I found this but they have been pretty cool about the whole deal. Might have a different plan on dealing with the guy. I was told this gshop is a big time deal with lots of top name customers.

tenxal · Post by **tenxal** » Wed Nov 20, 2019 8:32 am

Got to be way more to the story.

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