 KABOOM!, The F Production scatters! |
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| Jake Raby |
 Jul 9 2004, 11:31 AM
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#1
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Engine Surgeon  Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States  |
Damn, what a bad Friday....It was running better than ever before!
Here are the details that we know now. http://www.shoptalkforums.com/viewtopic.php?t=74056 I'm sure we lost a part, probably a rod- will know next week and will share some pics of some of the carnage.. This is our first failure in 3 years, and this one was a doozey, I doubt anything is salvageable! |
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| rick 918-S |
Jul 9 2004, 03:04 PM
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#2
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Hey nice rack! -Celette Group: Members Posts: 21,022 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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Jake,
What is the connecting rod ratio of your high reving type IV's? I know when a stock rod length is used in a BMW 2002 the ratio is 1.6875. Which means the motor will live at 6875 RPM's all day and ask for more. But when pushed over 7000 rpm's the crank speed and the piston speed become unequal. This results in the failure of the rod at the small end. It is literally jerked apart as the wieght of the crank and the speed of the piston work against each other. To increase the rev's longer rods are used with a custom piston. If your moving the rev's and power up 800 rpm's you may want to follow the BMW theory. Just something to consider... (IMG:style_emoticons/default/confused24.gif) I respect your work and knowledge of the type IV's. Your the expert not me. Nevermind... I just read the othe post. My question is too engine specific. |
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Posts in this topic
Jake Raby KABOOM! Jul 9 2004, 11:31 AM
Andyrew Ouch man..
I guess we learn from our mistakes rig... Jul 9 2004, 11:46 AM Jake Raby Someone made a mistake along the line... Either th... Jul 9 2004, 12:17 PM Andyrew So, your saying the parts should be able to handle... Jul 9 2004, 12:38 PM Jake Raby These parts had been handling the power just fine ... Jul 9 2004, 12:48 PM davep You can always learn from your mistakes. It is mor... Jul 9 2004, 02:24 PM grantsfo It blew at 7500 rpm. Wow I get nervous when I get... Jul 9 2004, 02:31 PM Jake Raby The engines powerband STARTS at 5500 RPM! Driv... Jul 9 2004, 02:40 PM davep I'll bet the marine training helps there. Nerv... Jul 9 2004, 02:58 PM Rich Bontempi Jake, What kind of rods are you using? Since I wen... Jul 9 2004, 04:05 PM Brett W Rich, the FP engine uses the stock 1.8 connecting ... Jul 9 2004, 04:37 PM fiid Bummer dude. I'm sure you'll learn a lot... Jul 9 2004, 05:09 PM
Randal Jake,
You should be bragging about that motor, i.... Jul 9 2004, 06:16 PM |
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