 New engine tragedy, Broken valve stem |
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| Jetsetsurfshop |
 Apr 2 2016, 06:36 PM
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#1
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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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| Jetsetsurfshop |
Apr 3 2016, 05:08 AM
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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 |
Didn't mean to be so vague. I've never seen this before and thought it'd would be a good this to post up as I fix it for future shade tree mechanics
Here's those specs (most of what I remember) 78mm crank dpr Scat h rods Je 96 mm Pistons with valve relief Heads are what the car came with and there on there last leg 48 mm intake 38 mm exhaust 49 cc head chamber Dual valve springs Custom length pushrods Stock valve train Camshaft duration is 318 lift is 533 (this is from memory) 44 dual Webers I found all these lovely parts last night and started to tear the rest down. Was going to try and remove the head from the car but the cooling tin behind the oil cooler looks like it's in the way. I'm hoping that the piston isn't damaged. We don't believe it is, but will post pics when I get there. I'm in retail and this is my season. Its agonizing to not be able to wrench but it will have to wait. I think valy nailed it too. Sounds like new valve train is in my future. |
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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 Mark Henry Ouch :(
what valves are those? Used stock? Intak... Apr 2 2016, 06:59 PM
Jetsetsurfshop
Ouch :(
what valves are those? Used stock? Inta... Apr 2 2016, 07:05 PM stugray
Ouch :(
what valves are those? Used stock? Int... Apr 2 2016, 07:31 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 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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