 2004 Porsche 911 Nickies Lineup, Thanks to Brad for all his help! |
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| Eric_Shea |
 Dec 23 2003, 03:40 PM
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#21
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PMB Performance  Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains   |
QUOTE i'm not -completely- sure what Eric is shooting for I was confused by this I guess... so I thought I'd clarify what I was shooting for. As far as I know the 2.2 and 2.4 84's are identical. Just the crank changed. But... that's as far as I know and that aint much. Hey... fellow PCA Editor, you're quoted in an article I'm running in my next issue. Want a pdf? |
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| ArtechnikA |
Dec 23 2003, 04:21 PM
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#22
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
QUOTE(Eric_Shea @ Dec 23 2003, 12:49 PM) I was thinking that there would be a bunch of vintage racers that may want the 89mm's on the short stroke cranks '911 Story' says they had reliability problems (broken cranks, flywheels that wouldn't stay on, rod problems) with that combination, due in part to the short, weaker rods. they do rev like a house afire tho. an alternative is to go the '0,040" over' approach and bore a 2,4 up to 2,5-liter. the big issue with the 2,4 street engines is that the compression was lowered about a point across the board so they were not much more powerful than the 2,2's, although they were much more flexible in traffic (fatter, broader torque curve). 86.5mm cylinders would be 2,5-l almost exactly - and while that's outside the old SCCA '0,040" over' rules - we're not talking about SCCA compliance... i think even if you did 0,040" over (85mm) with a proper 10.3:1 racing piston you wouldn't be giving away -that- much (100 cc) to a true 2,5-liter car... (in fact, you have to go 0,040" over the nominal 84mm bore to get a 'real' 2,4-l -- the factory's idea of 2,4-l in the street engines was a little optimistic ... |
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| Eric_Shea |
Dec 23 2003, 04:35 PM
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#23
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains |
So...... Charles,
Like I was saying... maybe some 89mm would be nice (IMG:style_emoticons/default/unsure.gif) Rich... I take it you don't want a pdf of the article? (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/laugh.gif) |
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| ArtechnikA |
Dec 23 2003, 04:38 PM
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#24
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
QUOTE(Eric_Shea @ Dec 23 2003, 02:35 PM) Rich... I take it you don't want a pdf of the article? PM'd you - yes, of course, i'd like a copy. sorry if i wasn't clear. |
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| cnavarro |
Dec 23 2003, 05:53 PM
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#25
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Cylinder Guru Group: Members Posts: 472 Joined: 30-December 02 From: Chicagoland! Member No.: 49 Region Association: None |
Ok, now that we've cleared that one up. (IMG:style_emoticons/default/blink.gif) I'll make some 89mm cylinders. I'll leave it at that. Or maybe even 89.5, hell let's milk the 2.5 to the last iota (2491ccs). Sounds good to me. Now the price that I have on the website, $1999, that is a promotional price that ends 01/01/04, then it goes to $2999. ARP Head studs can be included for $499. Pistons, as sourced off the shelf from EBS, run $895-1040 depending on ringsets. Any more questions?
Charles Navarro LN Engineering http://www.LNengineering.com Aircooled Precision Performance |
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| campbellcj |
Dec 24 2003, 12:09 AM
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#26
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I can't Re Member Group: Members Posts: 4,633 Joined: 26-December 02 From: Agoura, CA Member No.: 21 Region Association: Southern California 
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FWIW, I am a candidate for a 2.5 short stroke (66x89) also...if it could be built to reasonably stay together. My car is run for under 100 hours a year (guesstimate) but I can't afford breakages mid-year or a need for frequent tear-downs.
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| cnavarro |
Dec 24 2003, 07:41 AM
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#27
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Cylinder Guru Group: Members Posts: 472 Joined: 30-December 02 From: Chicagoland! Member No.: 49 Region Association: None |
I'll tell you what, an 89mm cylinder would have nice thick walls. Should last forever :-)
Charles Navarro LN Engineering http://www.LNengineering.com Aircooled Precision Performance |
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| scotty |
Dec 24 2003, 01:15 PM
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#28
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The Fun Never Stops Group: Members Posts: 773 Joined: 20-May 03 From: Portland. Oregon (SW) Member No.: 718 Region Association: None |
QUOTE Any more questions? ...could you have a sale in about five years? (IMG:style_emoticons/default/wink.gif) |
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| cnavarro |
Dec 24 2003, 03:21 PM
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#29
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Cylinder Guru Group: Members Posts: 472 Joined: 30-December 02 From: Chicagoland! Member No.: 49 Region Association: None |
Hopefully volume increases and the cost of plating can go down and I will be able to buy aluminum in 5 ton batches at a larger discount than what I pay at 1 ton now :-)
Charles Navarro LN Engineering http://www.LNengineering.com Aircooled Precision Performance |
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