Why is cast steel not used for cylinder heads prone to cracking with cast iron?Most 1950-60 MG' cyl.heads I see have cracked. Is it a price question or a material one?
Thanks for answers! What I saw was just the remains of the gears,happened some time ago. They are reputed mechanical restorers and the only thing I can think off is that the vegetarian oil that remained coagulated with the new GL5 oil. They do not mix.
The only reason I now for not using GL5 has...
I recently visited a restoration firm in Germany where I was shown a rea raxle with wormdrive where the bronze main gear was totally worn away.
The restorer told me that after changing to GL5 oil the axle started whining and desintegrated within one hour.
I know that some older EP oils had...
To :gruntguru: the rebuild with Arias pistons is what I did recently.
The failure history of the Original engines is interesting:
All the engines I took apart (about 10) with the Original H/C pistons showed seizure marks on the sides.
When it became apparent at the factory,after the American...
Well,the proposed project wasn't taken up by one of the students. Pity, as the lecturer found it interesting.He will keep the parts ,maybe later on someone will take it up.
Thanks all for the interesting comments.
Dirk
To Panther 140:the rod and piston are at the University as a project,will get results in april/may.
Investigation of the other rods showed that the thread was torn out partially on several of them.
That can only happen when a very heavy pulling load was applied,which makes the overevving...
The reasoning is right,with the exception that the bolts were new and engine only did 50 miles in total. I would not expect fatigue marks on an engine which is basically still running in?I gave the rod to the University lab and they will examine it next term. Will keep You posted then.
Dirk
Both pistons cast.The 9000 one I did myself.... Thought I was in 4th gear but was in 3rd.With the longer and lighter rods the engine is much smoother.I noticed something was wrong when I saw the rev needle pass the ignition light......After that it was silence.
The first engine was in 1st...
Hi all,
Dicer: 20/50 oil,no trace of the wrist pin. Might have thrown out with the debris of the underside of the piston.
I have some pictures of a similar engine desaster,also on cyL nr.2.
Rods are Phoenix,bolts ARP 2000 at 45 lbs.ft. Pistons were a lot lighter(Triumph Bonneville Powermax)...
Just wondering,as the rod is angled,and the piston broke first,whether there could not be shear implicated.
When the rod is blocked there would be side pressure on the cap lips as well.They are not designed to take those high loads and could move a bit sideways to create shear on the rod bolts.I...
Piston is Hepolite,made in 1958 and NOS. Difficult to make a claim...
No marks on the other pin bores,I measured the bore with a tripod mike, no deviations,wrist pins are quite heavy,very little movement axially possible even without circlips.
I went to my garage for another check on the block:there are no scratches or marks at all on the cyl. wall,exept honing marks.
As for the asymmetrical marks:the owner tried to restart the engine to see what was wrong;there was a lot of debris that could have been touching.Most of the bottom...
Tbuelna,You are right:being a bloody foreigner,I meant tensile instead of shear...I still think the piston broke first as there is not so much damage to the fracture. The bottom half of the piston was smashed into smitheriens.It must have got blocked in the bottom part of the cylinder somehow to...
