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Search took 0.14 seconds. Search: Posts Made By: trond
Forum: 911 Engine Rebuilding Forum 08-18-2025, 11:28 PM
Replies: 177
Views: 9,538
Posted By trond
well done and thanks for posting. How do you...

well done and thanks for posting. How do you like the cams ?
Forum: 911 Engine Rebuilding Forum 08-14-2025, 03:18 AM
Replies: 64
Views: 3,168
Posted By trond
Mistakes happen and there is also bad luck...

Mistakes happen and there is also bad luck sometimes. Please consider this failure could well be related to the one substandard rocker arm that I supplied myself (single DP1120 rocker). Maybe that...
Forum: 911 Engine Rebuilding Forum 08-12-2025, 12:01 PM
Replies: 64
Views: 3,168
Posted By trond
rockers were not hardwelded, cam was. Rockers...

rockers were not hardwelded, cam was. Rockers were rebushed and ground. They had perfect contact patch/alignment with the cam. But yes an incompatibility issue, OR an inferior rocker branded...
Forum: 911 Engine Rebuilding Forum 07-27-2025, 11:31 PM
Replies: 64
Views: 3,168
Posted By trond
Yes cams are hardwelded. The cam supplier now...

Yes cams are hardwelded. The cam supplier now wants me to send in a set of rockers to be hardwelded and say this will make the set up work. I understand this will make the rockers more resilient...
Forum: 911 Engine Rebuilding Forum 07-26-2025, 08:38 AM
Replies: 64
Views: 3,168
Posted By trond
Unfortunately the only photo I have of failed...

Unfortunately the only photo I have of failed rocker from the previous failure (hardwelded cam, different profile from same supplier). It failed after very short time same as latest failure. Picture...
Forum: 911 Engine Rebuilding Forum 07-26-2025, 08:31 AM
Replies: 64
Views: 3,168
Posted By trond
I have been looking for rocker and/or pictures...

I have been looking for rocker and/or pictures but no luck. I must have thrown it away unfortunately. Now it might have been a valuable datapoint. Not very clever of me. Sorry
Forum: 911 Engine Rebuilding Forum 07-25-2025, 11:14 PM
Replies: 64
Views: 3,168
Posted By trond
I believe you could be right.

I believe you could be right.
Forum: 911 Engine Rebuilding Forum 07-24-2025, 05:10 AM
Replies: 64
Views: 3,168
Posted By trond
unfortunately I don't know where that DP1120 came...

unfortunately I don't know where that DP1120 came from but it was used in my engine previously, with stock cams, and survived in that application
Forum: 911 Engine Rebuilding Forum 07-23-2025, 11:35 AM
Replies: 64
Views: 3,168
Posted By trond
I checked all rockers again today and it only the...

I checked all rockers again today and it only the one marked with DP1120 that has failed



http://forums.pelicanparts.com/uploads26/20250723_1908381753299191.jpg...
Forum: 911 Engine Rebuilding Forum 07-23-2025, 12:44 AM
Replies: 64
Views: 3,168
Posted By trond
Asco springs set to 34 mm. Don't know spring...

Asco springs set to 34 mm. Don't know spring pressure but more than stock
Forum: 911 Engine Rebuilding Forum 07-22-2025, 11:28 PM
Replies: 64
Views: 3,168
Posted By trond
I don't understand either why it is only one out...

I don't understand either why it is only one out of 12. Or how it is possible that that one could be completely destroyed so fast. Or why rockers would need to be hardwelded if the cam is hardwelded...
Forum: 911 Engine Rebuilding Forum 07-22-2025, 07:54 AM
Replies: 64
Views: 3,168
Posted By trond
latest update is I should have used hardwelded...

latest update is I should have used hardwelded rockers with hardwelded cam. Clearly advised on cam vendors webside but I missed it. Cost me two years off the road and enough money to launch the...
Forum: 911 Engine Rebuilding Forum 07-21-2025, 11:59 PM
Replies: 64
Views: 3,168
Posted By trond
picture of failed rocker ...

picture of failed rocker



http://forums.pelicanparts.com/uploads26/20250722_0954031753171116.jpg
Forum: 911 Engine Rebuilding Forum 07-18-2025, 02:30 AM
Replies: 64
Views: 3,168
Posted By trond
opened engine and all look perfect, including...

opened engine and all look perfect, including main bearings, con rod bearings and ims bearing. Not one spec of debris in sight. I will look closer at pump, but as oil pressures are as they should I...
Forum: 911 Engine Rebuilding Forum 07-17-2025, 11:51 PM
Replies: 64
Views: 3,168
Posted By trond
thanks a lot. Much appreciated. I am now in the...

thanks a lot. Much appreciated. I am now in the process of splitting the block. From oil flow diagram all debris is pumped back to oil tank, via oil filter. Yet I found no magnetic debris in oil...
Forum: 911 Engine Rebuilding Forum 07-16-2025, 01:33 AM
Replies: 64
Views: 3,168
Posted By trond
looking at oil circulation diagram it appears all...

looking at oil circulation diagram it appears all returns from engine go through the oil filter. What are chances for metal debris from cam lobe goes back into engine ? I have not seen any damage...
Forum: 911 Engine Rebuilding Forum 07-15-2025, 10:36 PM
Replies: 64
Views: 3,168
Posted By trond
agree. But HOW can there be an oiling issue when...

agree. But HOW can there be an oiling issue when I have good oil pressure and no plugging in the spray tube ? (new tube and bench tested they all spray). No lack of oil when I took off the valve...
Forum: 911 Engine Rebuilding Forum 07-15-2025, 10:31 AM
Replies: 64
Views: 3,168
Posted By trond
I checked contact patch and they were all...

I checked contact patch and they were all perfect. I was thinking cam issue as the same happened on previous rebuild with same cam supplier & new OE rockers. But hard to imagine such damage in just...
Forum: 911 Engine Rebuilding Forum 07-15-2025, 07:02 AM
Replies: 64
Views: 3,168
Posted By trond
what would you say then is a safe way with...

what would you say then is a safe way with rockers ? On previous lobe wipeout I had 12 new OEM on new cam. On this lobe wipeout I had 12 rockers checked for alignment and resurfaced. Eliminating...
Forum: 911 Engine Rebuilding Forum 07-14-2025, 11:57 PM
Replies: 64
Views: 3,168
Posted By trond
I used checked/resurfaced OE rockers straight...

I used checked/resurfaced OE rockers straight from a well known machine shop. After re-surfacing; is it then the pad hardened ? to what hardness ? I plan to have mine checked to see if it is a...
Forum: 911 Engine Rebuilding Forum 07-14-2025, 11:49 PM
Replies: 64
Views: 3,168
Posted By trond
yes, I agree it looks like binding rocker could...

yes, I agree it looks like binding rocker could have been the issue, but I checked for free travel especially on assembly (have seen it happen before) and also when disassembling. No rockers were...
Forum: 911 Engine Rebuilding Forum 07-14-2025, 12:04 PM
Replies: 64
Views: 3,168
Posted By trond
yes depressing. Worse even. I tore down the...

yes depressing. Worse even. I tore down the previous fiasco inn November and the process of getting parts, getting machining done, the time and the money; it has been a long uphill struggle And now...
Forum: 911 Engine Rebuilding Forum 07-13-2025, 11:40 PM
Replies: 64
Views: 3,168
Posted By trond
rocker arm and cam lobe failure

I just finished re-building 3.2SS with new cams and refurbished rockers. I ran engine 20 mins at 2000 rpm on mineral straight 30 and then changed to M1 5-50 (A40). Then took it for a drive an hour...
Forum: 911 Engine Rebuilding Forum 04-22-2025, 10:16 PM
Replies: 177
Views: 9,538
Posted By trond
apart from getting the carburettion right, what...

apart from getting the carburettion right, what are your impressions so far. I have same cams on order and similar engine configuration and am interested in how the combination works. Did you check...
Forum: 911 Engine Rebuilding Forum 03-19-2025, 11:00 PM
Replies: 177
Views: 9,538
Posted By trond
following this ! I have similar build and also...

following this ! I have similar build and also the same k75 cams on order. One question on ring gap you have 0.0175 ring gaps. A lot more than porsche build specs. Why ? Asking because I was...
Showing results 1 to 25 of 500
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