 New engine tragedy, Broken valve stem |
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| Jetsetsurfshop |
 Apr 2 2016, 06:36 PM
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Senior Member  Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States  |
On my first outing with the new engine tragedy struck. While giving it a little bit of RPM the engine made a noise I never heard before and then dropped a cylinder. Limped it home and this is what I found today.
That's the top of the valve you see still with the keeper! Damn. Anyone have any thoughts on what happened here? Everything we did was the same as the last build except we installed a more aggressive camshaft. (IMG:style_emoticons/default/headbang.gif) Attached thumbnail(s) 
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| Mark Henry |
Apr 2 2016, 06:59 PM
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Ouch (IMG:style_emoticons/default/sad.gif)
what valves are those? Used stock? Intake or exhaust? I see late adjusters, you shouldn't do that but that would only mash the valve stem end. engine spec details please. |
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| Jetsetsurfshop |
Apr 2 2016, 07:05 PM
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#3
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
QUOTE(Mark Henry @ Apr 2 2016, 04:59 PM)  Ouch (IMG:style_emoticons/default/sad.gif) what valves are those? Used stock? Intake or exhaust? I see late adjusters, you shouldn't do that but that would only mash the valve stem end. engine spec details please. 48mm intake 38mm exhaust They are stainless steel. We used the adjusters that the car had on it when I bought it. It was a mid build. What are you suggesting? 2258cc 44 webers Duel springs Old lift on cam was .465 new lift is .533 |
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| stugray |
Apr 2 2016, 07:31 PM
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#4
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE(Jetsetsurfshop @ Apr 2 2016, 07:05 PM) QUOTE(Mark Henry @ Apr 2 2016, 04:59 PM) Ouch (IMG:style_emoticons/default/sad.gif) what valves are those? Used stock? Intake or exhaust? I see late adjusters, you shouldn't do that but that would only mash the valve stem end. engine spec details please. 48mm intake 38mm exhaust They are stainless steel. We used the adjusters that the car had on it when I bought it. It was a mid build. What are you suggesting? 2258cc 44 webers Duel springs Old lift on cam was .465 new lift is .533 Did you have valve relief pockets in the pistons? with .533 you might have interference, more-so with oversize valves |
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Posts in this topic
Jetsetsurfshop New engine tragedy Apr 2 2016, 06:36 PM
Jetsetsurfshop Oh yeah
Broke the rocker arm too.
:headbang: Apr 2 2016, 06:37 PM
Jetsetsurfshop
[quote name='Jetsetsurfshop' post='2325100' date=... Apr 2 2016, 07:36 PM stugray
Did you have valve relief pockets in the pistons... Apr 3 2016, 09:48 AM Mark Henry
Ouch :(
what valves are those? Used stock? Int... Apr 2 2016, 10:00 PM fixer34 If that is the valve spring retainer, then you did... Apr 2 2016, 08:17 PM Valy That's a lot of lift for stock adjusters. The ... Apr 2 2016, 08:52 PM Cracker Bummer! I hate to see that...it IS part of the... Apr 2 2016, 08:53 PM Jetsetsurfshop Didn't mean to be so vague. I've never see... Apr 3 2016, 05:08 AM The Cabinetmaker I'm confused. Bigger valves, monster cam, dual... Apr 3 2016, 05:48 AM McMark I would love to see the valve train geometry befor... Apr 3 2016, 06:32 AM Mark Henry :agree:
I'm guessing that the cam is a Scat ... Apr 3 2016, 06:40 AM Jetsetsurfshop Cabinetmaker
I meant stock rocker arms. Sorry.
Th... Apr 3 2016, 08:14 AM HAM Inc The valve breaking in that position is a classic s... Apr 3 2016, 10:18 AM |
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