In case any of you here on Oppo wondered what a 7.5 liter V8 piston looked like

"matthewklein220" (matthewklein220) 08/21/2013 at 13:48 • Filed to: Project 455, Possible Banditbait

2

37

Actually, by the time I'm done, it's going to be nearly 7.6l! But I finally fished these out of the attic today, and I'll go hunting for the aftermarket rods that are up there somewhere tomorrow. For now, just bask in its gargantuan glory. (also sort of Banditbait)

moarpowerr > matthewklein220 08/21/2013 at 13:56

0

thats a bigun you got there

Blondude > matthewklein220 08/21/2013 at 13:56

0

Whoa.

Mr. Ontop, No Strokes, No Smokes...Goes Fast. > matthewklein220 08/21/2013 at 14:00

0

Looks like you'll need one of these to accomodate that piston.

cbell04 > matthewklein220 08/21/2013 at 14:03

0

Got girth? :) Wouldnt want to follow up after that piston.. Would be like throwing a hotdog down a hallway.. How much does each piston weigh, and what kind of rpms will it be turning? Cool pic keep em coming!

matthewklein220 > Mr. Ontop, No Strokes, No Smokes...Goes Fast. 08/21/2013 at 14:03

0

It's pretty possible, although I hope not for my wallet's sake!

desertdog5051 > matthewklein220 08/21/2013 at 14:04

0

My pistons are only a quarter of the size of yours. :)

That did not annotate well at all.

matthewklein220 > cbell04 08/21/2013 at 14:06

0

They're surprisingly light since, if I remember correctly, they're made from aluminum. As for RPMs, stock 455 rods barely last to 5,200 but with the new rods I could probably go to 7,000. Although with the heads I'm going to run, it'll probably start running out of power around 5,500/6,000.

matthewklein220 > desertdog5051 08/21/2013 at 14:09

0

My friend is building a 2.0l Type-R engine for his Civic, and I REALLY want to lay the pistons down side-by-side to compare them.

LandSpeed-DSM > matthewklein220 08/21/2013 at 14:19

0

Is it the rod that fails.. or the rod bolt? Or the wrist pin being ripped out of the piston?

Just curious. Most of my very high rpm failures (>9K) the rod its self was not the culprit.

PS9 > matthewklein220 08/21/2013 at 14:25

1

That's 7.5L per piston right? Still low. I won't drive anything that doesn't displace 10L/piston minimum.

matthewklein220 > PS9 08/21/2013 at 14:40

0

Sadly not, 7.5L for all 8 pistons. *cries for not being manly enough*

matthewklein220 > LandSpeed-DSM 08/21/2013 at 14:42

0

Well, I've never thrown a rod myself, so I'm not sure. All I know is that the Pontiac manuals and articles from guys who know their stuff say to never take stock rods over 5,200 or it'll end badly.

The Prince of Peugeot > matthewklein220 08/21/2013 at 14:47

0

My pistons look so tiny in comparison.

LandSpeed-DSM > matthewklein220 08/21/2013 at 15:06

0

Fair enough. I guess on that note.. also get a decent set of tool steel rod bolts and hope there is adequate meat around the pin! Hope we'll see a start up vid soon. What head/cam combo are you going with?

Bandit > matthewklein220 08/21/2013 at 15:19

0

Sort of? What car and engine? My pistons only do 6.6 liters :(

MonkeePuzzle > The Prince of Peugeot 08/21/2013 at 15:21

0

that's what she...

MonkeePuzzle > matthewklein220 08/21/2013 at 15:28

0

pfft, my civic will still smoke it! (that's a thing ricers still say right?)

hollanddjw 1 > matthewklein220 08/21/2013 at 15:49

0

Looks aircraft-grade.

GreenN_Gold > The Prince of Peugeot 08/21/2013 at 17:36

0

You know what they say about a guy with small pistons...

...small rods.

The Prince of Peugeot > GreenN_Gold 08/21/2013 at 19:40

0

D:
but it's cute

matthewklein220 > LandSpeed-DSM 08/21/2013 at 21:02

0

Probably some ported #62 factory heads, and the Ram Air IV cam. Although the build probably won't be finished until sometime into next spring.

matthewklein220 > MonkeePuzzle 08/21/2013 at 21:03

0

I like that photo, totally gives the sense of scale!

matthewklein220 > Bandit 08/21/2013 at 21:06

0

My Firebird, with the 455 pulled out of an either an early second-gen 'Bird or a Wagon (I can't remember which). The 350 is starting to suck oil past the valve guides whenever you lift off the throttle. And this is sort your bait because aside from the rods and intake, this build is all Pontiac factory parts! (Similar to your engine)

Bandit > matthewklein220 08/21/2013 at 21:07

0

What year bird? 2nd gen? You now have me interested.

matthewklein220 > The Prince of Peugeot 08/21/2013 at 21:08

0

Holy cow! Your rods look starved compared to mine! (Still no pic, the attic is a labyrinth of boxes and parts)

Bandit > matthewklein220 08/21/2013 at 21:08

0

Never mind. I forgot you have the gold bird, tis an awesome car man.

matthewklein220 > Bandit 08/21/2013 at 21:10

0

I'm anxious to see what your's is like once that engine is done, we'll have to do a road trip and meet up in the middle!

Bandit > matthewklein220 08/21/2013 at 21:11

0

Ha! That would be awesome.

matthewklein220 > Bandit 08/21/2013 at 21:15

0

As for year, 455's were available in Firebirds from '71 to '76. And any Pontiac full-size (plus GTO) from '70 to '76. There are blocks out there, you just have to find them! (Which is easy, since the displacement is stamped right on the side of the block)

Bandit > matthewklein220 08/21/2013 at 21:18

0

I actually meant your car.

The date your engine was made should be stamped where the distributor goes. There is a letter followed by a few numbers. The letter corresponds with the month made (A = jan.) the numbers after that are the day (02 = 2nd day of month). The last number is the year (3=73).

matthewklein220 > Bandit 08/21/2013 at 21:22

0

Oh! My car! My car was Oct.(?) of '68. But it's a '69 model. And the engine is the original HO 350 that came from the factory. with about a bazillion miles on it.

Bandit > matthewklein220 08/21/2013 at 21:23

0

Awesome! Plan on keeping the original block?

matthewklein220 > Bandit 08/21/2013 at 21:25

1

Oh definitely, you know how rare 4-barrel 350's are??? I'll probably rebuild later on, so this 455 can be transplanted into the '71 Trans Am. But for now, it's being built with the '69 in mind.

The Prince of Peugeot > matthewklein220 08/21/2013 at 21:30

0

Yeah my rods are really thin. My personal reasoning behind it is because it's a sportbike engine, it's very high revving (13k redline), but it has almost no torque (18.1 Ft/Lbs @10,000 RPM ) so they don't need to be very strong.

matthewklein220 > The Prince of Peugeot 08/21/2013 at 21:33

0

Makes sense, you want the reciprocating mass to be as light as possible, without breaking. Which means you can rev infinitely higher than me. (I don't even want to think about what would happen to my engine at 13,000 rpms...)

The Prince of Peugeot > matthewklein220 08/21/2013 at 23:12

0

Might look a little like this

matthewklein220 > The Prince of Peugeot 08/22/2013 at 03:13

0

I don't even...Why would they do that? Also, I think my engine would be somewhere more along the lines of an explosion.