V8 Rumble - Page 2

2.2 Straight six · #16 10-01-2006, 05:38 PM

damn you!

my stars are purple. i win.

psychopathicdude · #17 10-01-2006, 07:03 PM

yes, the lads at Powertec are making V8s as though they were making biscuits....take (2) four-cylinder engines, (1) reverse mounted cylinder head, modified block, custom ground camshafts, custom crankshaft, custom engine management, add fuel, and you have Formula 1 performance at Daimler-Chrysler price! Damn them....I wanted to do it first.

534BC · #18 10-01-2006, 07:38 PM

A flat crank definately sounds different. I can't remember the last place I heard one. Do 2 cyclinders fire at same time?

GreyGoose006 · #19 10-01-2006, 08:59 PM

it has to do with the order the cylinders fire in.
i'm not sure of the order, but it makes a different noise than an 'american' design V-8

534BC · #20 10-02-2006, 10:22 AM

A normal 90 degree v-8 has 2 cylinders up at same time, going to a flat crank ould have 4 cylinders up at the same time and 2 must be fired at once, sounding like a "pair of inline 4's"

GreyGoose006 · #21 10-02-2006, 11:47 AM

isnt that rather inefficient tho?
wouldnt it be better to take two inline 4 cranks and connect them, but rotate one 90*
that way, the firing would be more uniform

534BC · #22 10-02-2006, 12:50 PM

Yes, I think so. That's probably why all v-8 are 4 different throws on the crank. I can't for the life of me remember what the idea was with going to a flat crank in a v-8, I haven't heard many, but if I remember correctly were in pulling tractors and had a very distinct sound that could not be mistaken, but they never seemed to catch on very well.

GreyGoose006 · #23 10-02-2006, 01:23 PM

side to side balance would suck...

drunken monkey · #24 10-02-2006, 02:17 PM

and yet is still there in a ferrari 360 and the V8 in a TVR.

Dyno247365 · #25 10-02-2006, 10:21 PM

Quote:

Originally Posted by psychopathicdude

yes, the lads at Powertec are making V8s as though they were making biscuits....take (2) four-cylinder engines, (1) reverse mounted cylinder head, modified block, custom ground camshafts, custom crankshaft, custom engine management, add fuel, and you have Formula 1 performance at Daimler-Chrysler price! Damn them....I wanted to do it first.

OMG bro I don't know which one of your posts I want for my signature. They're so funny

Dyno247365 · #26 10-02-2006, 10:24 PM

Quote:

Originally Posted by drunken monkey

and yet is still there in a ferrari 360 and the V8 in a TVR.

A flat crank V8?

2.2 Straight six · #27 10-02-2006, 10:36 PM

yup.

534BC · #28 10-02-2006, 11:40 PM

Quote:

Originally Posted by psychopathicdude

Don't forget the very different and distinct sound of a V8 with a flat-plane crank. Sounds more like two high-strung 4 cyclinders in harmony. Or four Harleys in a row. No rumble....more of a scream. Odd, to make a V8 sound more like a Hayabusa...but it'll net you better crank balance, higher redlines, and lower reciprocating weight, due to not needing excessive counterweights. I want one.

That's right, I forgot. No big counterweights and no bob weights . The two end pins are lined up right? and the 2 center pins?

UncleBob · #29 10-02-2006, 11:41 PM

exact same crank geometry as an I4, just two con rods per journal instead of one

what would be really interesting would be a big bang V8 in such a config. 1 & 7 would fire at the same time, as would 3 & 5, 2 and 8, 4 & 6

Basically a really big V4 engine

Dyno247365 · #30 10-03-2006, 05:17 PM

Quote:

Originally Posted by 534BC

That's right, I forgot. No big counterweights and no bob weights . The two end pins are lined up right? and the 2 center pins?

what pins? gotta picture?

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