Built 5862 I Just Wanna Go Fast (Formerly Known as Mazdazilla's Build Thread Thingy)

Maybe its a non-issue, but arent you concerned running those dump tubes through your cowl being so close to your windshield glass with the heat? Or maybe its further away than it looks?

 

That has crossed my mind. I'll be wrapping the inside of the cowl with head reflective tape and the tubes will be wrapped in header wrap. If that's not enough I'll have the tubes tweaked to sit further away. I think I'll have issues melting the plastic above them before the windshield gets damaged.

 

The exhaust wrap will help a ton. My down pipe is almost cool to the touch with the stuff on it. (almost)

 

More fun came in the mail today!



I bought rods and pistons. Specifically, Shawn's old rods and pistons. 11:1 compression, a fairly interesting shape fuel bowl design too. But most importantly, they worked with my budget and they're 88mm so I won't have to worry about any issues with the cylinder wall being out of spec or out of round. Now that most of the important stuff is out of the way I can dive into getting the bottom end cranked out this coming semester!

 

You'd think ridges like those on the domes would create hotspots, but I'm sure the piston engineers know way more about this than me... Anyways, I'm jelly.

 

The spark plug is much more likely to become a hot spot than any ridges on a piston face design. Simply for the reason that the burn is always hottest at the spark plug since it is initiated there. Not only that but spark plugs are ferrous and therefore do not expel heat as fast as Al does. Take a look at our combustion chamber too, the very sharp ridge between the exhaust valves is much more likely to have a hotspot than the piston. I am not worried, these have already been taken to 700whp without issue

 

Yeah, I noticed that about our heads. Maybe they smooth out iron heads more? (If they're still widely used anyways, LOL)

 

Can't say for sure since my experience with iron heads is pretty limited, buuuut back in the day leaded fuel was pretty damn knock resistant so it probably wasn't as much of an issue. I know when lead was outlawed there were TONS of issues with iron heads. Knocking, nonhardened valve seats, etc.

 

Well, the cat's pretty much out of the bag now. As a good amount of you can guess/know I'm running the new DM manifold. I was really hoping to be able to give some results but MY FUCKING FAB GUY HAS BEEN EVADING ME FOR THE PAST FUCKING MONTH AND I CAN'T EVEN PUT INTO WORDS HOW FRUSTRATING THIS IS. He has my dump tubes, still has to do MINOR exhaust work and owes me money. I wouldn't be nearly as pissed if he'd at least call or txt me back but nope, not one word from him for over a week and the last time I talked to him he was in town and was supposed to do the ever so simple thing of dropping off my dump tubes. I want my car running so badly but this is starting to get ridiculous.

Pictures,

 

Dusty fun bags!

 

Is that hot pipe going to clear your hood?

 

It'll be close. If it doesn't I'll chop and reweld.

 

Any one pressure tested a ST manifold? Just curious when the plastic let's go. I know the old SVT plastic manifolds would come apart at about 8 psi, but those weren't boosted from the factory

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I'm sure it'll be much, much higher, especially coming off of a factory-boosted platform. It would be nice though to pressure test them to see at which point they fail. I'd bet it's north of 30psi if they followed typical overengineering rules of thumb.

 

I would assume so as well, but with the possibly of people using PI on this, there is a chance that people will want to run some decent boost. So I could see north of 35 PSI being possible. Just more of a curiosity than anything. I would assume its fine.

 

A long time ago SP63 put like 120psi+ into it on a bench, popping the air source off before the manifold failed.

I am currently putting about 32psi into it regularly. Last weekend the car decided it wanted a bit more and unhooked the WG line on me, so it saw way more than that and started popping couplers left and right before anything happened to the manifold. Unfortunately I failed to log, so I couldn't tell you how much boost it was.

 

Good to know. But what if I planned to run more than 120 PSI? Then this probably isnt for me then? Is that what you are saying? haha

 

I'd still give it a shot. The manifold was fine at 120psi in their bench test. LOL

 

We'd have to change who was named Big Boost MS3 if you run more than 120psi.

 

ROTFLOL! In before MS6's running 100+psi and competing in sled pulling.