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> What's on the, INSIDE
Randal
post Mar 22 2009, 10:16 PM
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I have to send my computer to HP for repair so was cleaning out some files today.

I had forgot just how nice a proper engine can look, from the inside.

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SirAndy
post Mar 22 2009, 10:39 PM
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They only look that nice once ...
(IMG:style_emoticons/default/biggrin.gif) Andy
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Randal
post Mar 22 2009, 10:42 PM
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QUOTE(SirAndy @ Mar 22 2009, 09:39 PM) *

They only look that nice once ...
(IMG:style_emoticons/default/biggrin.gif) Andy



Oh, but what a great learning process.
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grantsfo
post Mar 24 2009, 02:47 PM
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Like like the simplicity. Thats a great motor. Glad the top end issues have been sorted. Cant wait to hear that thing rev up to 7 grand!
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McMark
post Mar 24 2009, 09:00 PM
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That crank is gorgeous! (IMG:style_emoticons/default/drooley.gif)
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Randal
post Mar 24 2009, 09:08 PM
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QUOTE(McMark @ Mar 24 2009, 08:00 PM) *

That crank is gorgeous! (IMG:style_emoticons/default/drooley.gif)


Only the crank Mark? See anything else special?
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Chris Hamilton
post Mar 24 2009, 09:42 PM
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Does that mean I get to post mine?

Randal, are those pauter rods in your engine?

(IMG:http://hamiltonracing.net/photos/cliff914/build/IMG_2540small.JPG)
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Randal
post Mar 25 2009, 05:12 AM
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QUOTE(Chris Hamilton @ Mar 24 2009, 08:42 PM) *

Does that mean I get to post mine?

Randal, are those pauter rods in your engine?

(IMG:http://hamiltonracing.net/photos/cliff914/build/IMG_2540small.JPG)




They are SCAT rods Chris.
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grantsfo
post Mar 25 2009, 10:58 AM
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QUOTE(Chris Hamilton @ Mar 24 2009, 08:42 PM) *

Does that mean I get to post mine?

Randal, are those pauter rods in your engine?

(IMG:http://hamiltonracing.net/photos/cliff914/build/IMG_2540small.JPG)

Nice Chris, What are you building? Or has it already been built?
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Chris Hamilton
post Mar 25 2009, 08:03 PM
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QUOTE(grantsfo @ Mar 25 2009, 09:58 AM) *

QUOTE(Chris Hamilton @ Mar 24 2009, 08:42 PM) *

Does that mean I get to post mine?

Randal, are those pauter rods in your engine?

[imgb]http://hamiltonracing.net/photos/cliff914/build/IMG_2540small.JPG[/img]

Nice Chris, What are you building? Or has it already been built?


Thats the engine in cliff's 914:

http://hamiltonracing.net/photos/cliff914/...sa/IMG_3767.JPG

It's a 2.0 rabbit-rods with what webcam calls "the ultimate street cam". Never used that cam before and I have to say for a car he's gotta drive every day it's just about perfect.

My engine is basically identical, but with a stock 914 cam, and this webcam has a lot more punch in the midrange, and the engine seems to rev a bit freer. We had the 6k chip in the rev limiter at santa rosa, but up to that it pulled nicely, whereas my car with the stock cam seemed to get kinda sluggish up to my rev limiter at 7k.

I'd love to see if someone in this area would be willing to strap his car to a dyno and see what it puts out, because it feels great.
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sww914
post Mar 25 2009, 10:26 PM
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One of the shops at Buttonwillow has a dyno that's not too expensive.
Chris, what's the advantage of Rabbit rods?
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J P Stein
post Mar 26 2009, 12:00 AM
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Sometimes complex is mo better. (IMG:style_emoticons/default/biggrin.gif)


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SirAndy
post Mar 26 2009, 12:39 AM
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QUOTE(J P Stein @ Mar 25 2009, 10:00 PM) *

Sometimes complex is mo better. (IMG:style_emoticons/default/biggrin.gif)

Sometimes not having to open the motor at all is even morer betterer ... (IMG:style_emoticons/default/shades.gif)



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Chris Hamilton
post Mar 26 2009, 09:31 AM
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QUOTE(sww914 @ Mar 25 2009, 09:26 PM) *

One of the shops at Buttonwillow has a dyno that's not too expensive.
Chris, what's the advantage of Rabbit rods?


That would be nice, I'm sure cliff would be up for it.

The rabbit rods fix the fact that the 914 didn't come with a very good rod-length ratio. The 914 engine doesn't "breathe" very well, and the increased rod-length ratio improves that.

If you want the physics explanation, you get that Work equals the dot product of the force and direction vectors.

W = F • d, which simplified for a 2-dimensional scenario becomes W = F * d * cos ( theta ). If you increase the rod length you decrease the change in angle caused by the sweep of the connecting rod and minimize the potential range of theta.

Steve, you've driven Cliff's car, right? This rod length change manifests itself in a bunch more bottom end power.
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Randal
post Mar 26 2009, 10:30 AM
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QUOTE(J P Stein @ Mar 25 2009, 10:00 PM) *

Sometimes complex is mo better. (IMG:style_emoticons/default/biggrin.gif)



It'd be fun to have those chains on a 4.... and overhead cams.
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J P Stein
post Mar 26 2009, 12:27 PM
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Even better would be a five main bearing crank....just my .05. (IMG:style_emoticons/default/biggrin.gif)
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grantsfo
post Mar 26 2009, 01:31 PM
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QUOTE(Chris Hamilton @ Mar 26 2009, 08:31 AM) *

QUOTE(sww914 @ Mar 25 2009, 09:26 PM) *

One of the shops at Buttonwillow has a dyno that's not too expensive.
Chris, what's the advantage of Rabbit rods?


That would be nice, I'm sure cliff would be up for it.

The rabbit rods fix the fact that the 914 didn't come with a very good rod-length ratio. The 914 engine doesn't "breathe" very well, and the increased rod-length ratio improves that.

If you want the physics explanation, you get that Work equals the dot product of the force and direction vectors.

W = F • d, which simplified for a 2-dimensional scenario becomes W = F * d * cos ( theta ). If you increase the rod length you decrease the change in angle caused by the sweep of the connecting rod and minimize the potential range of theta.

Steve, you've driven Cliff's car, right? This rod length change manifests itself in a bunch more bottom end power.


So are you increasing stroke with these rods? What size cylinders and pistons? What is stroke? Assuming you are increasing displacement and compression ratio too? It makes sense if you stroke a stock 2.0 that you would get more displacement and power.
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Chris Hamilton
post Mar 26 2009, 06:08 PM
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QUOTE(grantsfo @ Mar 26 2009, 12:31 PM) *


So are you increasing stroke with these rods? What size cylinders and pistons? What is stroke? Assuming you are increasing displacement and compression ratio too? It makes sense if you stroke a stock 2.0 that you would get more displacement and power.


Nah, rod length doesn't affect stroke, the offset of the crank journals is the only factor in determining stroke. We keep the compression low so it will run on pump gas, compression is basically the same as stock. Cylinders are iron 94mm.
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Joe Ricard
post Mar 26 2009, 07:35 PM
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My 2098cc has Wasser Boxer rods. Longer as well, lighter and stonger with ARP equalivent rod bolts. on a lightened 71mm crank with type 1 journals 11lb flywheel the motor spins very fast. Longer duration at TDC makes more power
and will also screw you big time with an aggresive cam as the valve is opening faster than the piston is going down in the intake stroke. Well if you are using domed pistons. (IMG:style_emoticons/default/biggrin.gif)
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grantsfo
post Mar 27 2009, 08:43 AM
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QUOTE(Chris Hamilton @ Mar 26 2009, 05:08 PM) *

QUOTE(grantsfo @ Mar 26 2009, 12:31 PM) *


So are you increasing stroke with these rods? What size cylinders and pistons? What is stroke? Assuming you are increasing displacement and compression ratio too? It makes sense if you stroke a stock 2.0 that you would get more displacement and power.


Nah, rod length doesn't affect stroke, the offset of the crank journals is the only factor in determining stroke. We keep the compression low so it will run on pump gas, compression is basically the same as stock. Cylinders are iron 94mm.

Oh assumed you were doing something differnt with crank. So just compression is being increased. What kind of compression? How long are these rods?
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