 rebuilt engine knocking?, engine builder says its normal for big bore 4's? |
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| narino |
 Jun 5 2010, 06:04 PM
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Member  Group: Members Posts: 234 Joined: 14-August 07 From: Los Angeles, CA Member No.: 8,001 Region Association: None 
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Alright I understand these cars don't have the quietest, smoothest runnning engines made, but does this doesn't sound right to me. There is a knocking sound at startup until she's warmed up. Then it smooths out, not completely though still can hear the knock.
The engine builder, who builds racing type IV engines says that the noise is typical with big bore type IV engines. Here is a link to a video, what do you guys think? video http://www.narino.com/images/914-knocking.wmv Here is what the engine currently has inside it: (originally a 1.7) 103 mm x 78 Stroke 2.0 H beam 5.325 (? no idea what this is was on the paper) G - Cam 44 x 38 Heads Thanks in advance! (IMG:style_emoticons/default/beer.gif) |
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| VaccaRabite |
Jan 6 2011, 08:33 AM
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En Garde! Group: Admin Posts: 13,729 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region
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$650 is probably a deal to have the work done, considering he is going to have to re-balance, redo deck height and maybe even redo pushrod geometry.
Zach |
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| Root_Werks |
Jan 6 2011, 09:47 AM
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Village Idiot Group: Members Posts: 8,668 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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QUOTE(Vacca Rabite @ Jan 6 2011, 06:33 AM)  $650 is probably a deal to have the work done, considering he is going to have to re-balance, redo deck height and maybe even redo pushrod geometry. Zach (IMG:style_emoticons/default/agree.gif) |
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Posts in this topic
narino rebuilt engine knocking? Jun 5 2010, 06:04 PM
Lennies914 If I were the builder I would want to see and hear... Jun 5 2010, 08:37 PM kg6dxn does not sound right to me. I think he did not cle... Jun 5 2010, 09:26 PM
hot_shoe914
does not sound right to me. I think he did not cl... Jun 5 2010, 09:58 PM charliew Either that or just rev it up and hold it it at ab... Jun 5 2010, 09:42 PM kg6dxn
Either that or just rev it up and hold it it at a... Jun 5 2010, 09:50 PM SLITS Why don't you ask how much clearance was used ... Jun 5 2010, 10:19 PM McMark Also what deck height. I've seen an engine th... Jun 5 2010, 10:25 PM aircooledtechguy
Also what deck height. I've seen an engine t... Jun 6 2010, 12:47 PM Brodie Doesn't sound good to me. Could be piston sla... Jun 6 2010, 10:55 AM jmill From your explaination I figured it was just noise... Jun 6 2010, 11:11 AM sean_v8_914 is it cold? hot? change intensity with increaese i... Jun 6 2010, 01:27 PM narino Thanks for the help guys.
Mike - I'm going to... Jun 6 2010, 02:04 PM kg6dxn If it is deck clearance you can shim the bottom of... Jun 6 2010, 04:32 PM Jake Raby Sounds like the builder used a forged piston set w... Jun 6 2010, 06:03 PM Eddie914 I have owned a number of 1988 BMW M5's. The S3... Jun 6 2010, 07:52 PM tornik550 Sounds like the rocker arms are hitting the valve ... Jun 6 2010, 08:04 PM detoxcowboy
Sounds like the rocker arms are hitting the valve... Jun 7 2010, 08:51 AM Jake Raby If the valve covers were seeing contact from the r... Jun 6 2010, 08:23 PM Cap'n Krusty Who is the rebuilder?
The Cap'n Jun 7 2010, 08:44 AM sean_v8_914 I dont think my 103s are that loud...maybe Im used... Jun 7 2010, 10:27 AM Jake Raby Yes, the stroke changes the rod angle, which can i... Jun 7 2010, 10:41 AM narino Just talked to the builder and he was more than ha... Jun 7 2010, 11:29 AM Jake Raby Good for you to wait till see how things work out ... Jun 7 2010, 12:26 PM narino Ok bringing this one back. After paying off some c... Jan 5 2011, 07:21 PM rick 918-S
Ok bringing this one back. After paying off some ... Jan 5 2011, 09:05 PM karlo Forging eliminates metal porosity and improves duc... Jan 6 2011, 01:47 AM narino Again, thank you guys for your replies.
Vacca/Roo... Jan 6 2011, 12:58 PM Vacca Rabite
I guess after the swap to cast pistons could I e... Jan 6 2011, 01:55 PM realred914 if it is too much noise for you ask to hear one of... Jan 6 2011, 02:15 PM narino Builder says as long as the piston all weigh the s... Jan 6 2011, 02:30 PM |
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