 Engine failure on track day, need some help, T4 GB 2.0 head failure |
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| CheeRS |
 May 11 2019, 06:38 PM
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#21
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Member  Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France  |
QUOTE(Bleyseng @ May 11 2019, 09:57 AM)  Buy a set of these with the coating to keep the heat out of the head. A adress to have a quote and check if there is shipping in France ? |
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| BeatNavy |
May 11 2019, 06:47 PM
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#22
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Certified Professional Scapegoat Group: Members Posts: 2,954 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region 
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| Jetsetsurfshop |
May 11 2019, 07:36 PM
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#23
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Senior Member Group: Members Posts: 815 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
(IMG:style_emoticons/default/biggrin.gif)
Good money spent. Attached thumbnail(s) 
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| Superhawk996 |
May 11 2019, 08:22 PM
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#24
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914 Guru Group: Members Posts: 7,224 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(Dave_Darling @ May 10 2019, 10:46 PM) After you look at the heads, consider the LN series heads from the Type 4 store, or if you have a good machinist locally consider getting new head castings from AMC in Spain and using them as cores. It might make more sense to repair yours, but new castings are available. --DD I'm considering options for heads. Checked Type 4 store and it seems they don't list the LN series. Other's looks to be for Transporters? Am I missing something? |
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| Dave_Darling |
May 11 2019, 10:15 PM
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#25
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914 Idiot Group: Members Posts: 15,204 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Sorry, I meant LE series heads.
But they look to be more than just equivalent heads to the 2.0, so they may not work with your class rules. Still, new AMC castings plus a good machine shop to replace the wear parts (guides, seats, valves, springs, etc.) which aren't great quality on the AMC heads. And I think the AMC heads come from Spain, so you can save some in shipping. --DD --DD |
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| porschetub |
May 11 2019, 11:58 PM
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#26
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Advanced Member Group: Members Posts: 4,887 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I would be rather worried about rebuilding those heads considering you use the car in competition events,with constant head cycling they get soft and don't hold the valve seats well ,the exhaust side suffers most for obvious reasons.
For what you will be spending on these old heads the AMC option is the best longterm solution,as far as your class rules go you can buy them with stock valve sizes so you should be fine. By the way nice workshop and cars WOW. (IMG:style_emoticons/default/welcome.png) |
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| CheeRS |
May 12 2019, 02:21 AM
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#27
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Member Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France |
I had a look on amc spain, 914 heads are not available yet (IMG:style_emoticons/default/sad.gif)
About head seals, on a french forum, I get the differents responses, with or without head seal between cylinders and head. seals are on the Porsche PET. your opinion ? |
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| Superhawk996 |
May 12 2019, 08:06 AM
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#28
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914 Guru Group: Members Posts: 7,224 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(CheeRS @ May 12 2019, 04:21 AM) About head seals, on a french forum, I get the differents responses, with or without head seal between cylinders and head. seals are on the Porsche PET. your opinion ? Oh no . .. . here we go. (IMG:style_emoticons/default/popcorn[1].gif) |
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| r_towle |
May 12 2019, 08:27 AM
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#29
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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no head seal (gasket) needed.
You can lap the cylinders to the heads to get a good seal. Without that Head Temp Sensor, its possible that you ran too lean. Thus, you dropped the valve. Good luck with the new rebuilt heads, they may work out, but using old head tends to be a gamble (one I do all the time) rich |
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| Mark Henry |
May 12 2019, 12:13 PM
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#30
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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 |
You can get new bare 914 2.0 cores from AA performance, they come with nothing, no seats, guides hardware etc. IIRC they do come with the exhaust studs.
They would need to be sent to a machine shop, you have to use 8mm stem exhaust valves and guides. |
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| sithot |
May 12 2019, 02:24 PM
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#31
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Member Group: Members Posts: 448 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None
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QUOTE(CheeRS @ May 11 2019, 08:36 PM) QUOTE(Bleyseng @ May 11 2019, 08:43 AM) If I were you I'd order a set of new castings set up by Len at HAM for replacing those. I just did mine with a set from him including having bigger valves installed (44x38). Well worth every penny! To keep the race passport available, I need to keep the engine stock specs. When did people stop cheating? Sand bagging is ALWAYS an option. (IMG:style_emoticons/default/biggrin.gif) |
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| Bleyseng |
May 12 2019, 03:51 PM
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#32
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
QUOTE(Mark Henry @ May 12 2019, 11:13 AM) You can get new bare 914 2.0 cores from AA performance, they come with nothing, no seats, guides hardware etc. IIRC they do come with the exhaust studs. They would need to be sent to a machine shop, you have to use 8mm stem exhaust valves and guides. This is the route I took with Len to make my set. |
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| CheeRS |
May 12 2019, 04:51 PM
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#33
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Member Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France |
QUOTE(r_towle @ May 12 2019, 08:27 AM) no head seal (gasket) needed. You can lap the cylinders to the heads to get a good seal. Without that Head Temp Sensor, its possible that you ran too lean. Thus, you dropped the valve. Good luck with the new rebuilt heads, they may work out, but using old head tends to be a gamble (one I do all the time) rich Bonsoir, what do you mean by lap the cylinder to the head ? (I'm French) (IMG:style_emoticons/default/beer3.gif) |
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| porschetub |
May 12 2019, 06:31 PM
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#34
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Advanced Member Group: Members Posts: 4,887 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(CheeRS @ May 13 2019, 10:51 AM) QUOTE(r_towle @ May 12 2019, 08:27 AM) no head seal (gasket) needed. You can lap the cylinders to the heads to get a good seal. Without that Head Temp Sensor, its possible that you ran too lean. Thus, you dropped the valve. Good luck with the new rebuilt heads, they may work out, but using old head tends to be a gamble (one I do all the time) rich Bonsoir, what do you mean by lap the cylinder to the head ? (I'm French) (IMG:style_emoticons/default/beer3.gif) Use lapping compound same as used for doing inlet and exhaust valves,the sealing rings don't last and are no longer used ,have seen some cause heads to come loose and resulting leakage. Google VW barrel to head lapping you will find more info as its hard to explain,been doing it on T1 motors for years the 914 motor needs it too. Good luck. |
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| CheeRS |
May 13 2019, 04:19 PM
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#35
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Member Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France |
tomorrow I dismount the second cylinder head and I will take them to the technician.
about cylinders and pistons, they have 30.000kms. The segments are good but I have the impression that seen from above there is space between cylinder and piston. Is the top of the piston a bit conical? 30.000 were made in WOT rallye position so could be used. Which model of pistons and cylinders do you recommend ? I do not want to machine the block but it is useful to climb a little cubic with the djetronic ? I'm thinking about a 96mms upgrade. Regarding the head temperature sender I found the place to plug it, thanks to 914wold community. (IMG:style_emoticons/default/flag.gif) |
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| CheeRS |
May 14 2019, 05:34 AM
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#36
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Member Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France |
the actual pistons are AA 93,95
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| CheeRS |
May 16 2019, 01:44 PM
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#37
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Member Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France |
Bonsoir tout le monde, with your help, thinks are more accurates for me now.
Heats will be fully rebuild by a very good specialised workshop. New cylinders are not expensive, will be AA perf in 96mms. New engine and djetronic engine beam, injectors fully checked. Question : what about a external additional oil heater ? |
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| veltror |
May 16 2019, 04:38 PM
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#38
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Senior Member Group: Members Posts: 930 Joined: 27-April 08 From: Potters Bar Herts UK Member No.: 8,978 Region Association: None |
Since you are in Europe, just across the water talk to Rainier at Orratech Germany.
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| CheeRS |
May 18 2019, 02:37 PM
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#39
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Member Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France |
Hello, this week, heads will be shipped to the specialised shop.
Cylinders and pistons seem to be good but compare to the price, why not a new set in 96mms ? Found 3 shops in EU, not sure all are flat pistons. https://www.mecatechnic.com/fr-FR/kit-cylin...0-l_KD12506.htm or http://www.slideperformance.com/kit-cylind...bi-karmann.html or https://www.typ4shop.de/Motorteile-Kolben-W...-2-1L::100.html All the wiring questions about Djectronic are done, thanks |
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| CheeRS |
May 18 2019, 02:39 PM
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#40
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Member Group: Members Posts: 93 Joined: 5-May 19 From: Paris France Member No.: 23,093 Region Association: France |
Was surprised to found this modification on my engine
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