Speed six chain issues
Discussion
Anyone who has had chain issues, half time bearing issues, please can you post or PM me. Sorry no finger follower, oil leaks, head gaskets, over heating etc just chains and half time bearings
Interested to hear about engine size (3.6/4.0), year, crank material if know or if not red rose, S or standard. Anyone with a crank that had the extended nose please tell me what you can esp. about chain issues.
Many thanks
Cheers, J
Interested to hear about engine size (3.6/4.0), year, crank material if know or if not red rose, S or standard. Anyone with a crank that had the extended nose please tell me what you can esp. about chain issues.
Many thanks
Cheers, J
I had noisey chain issues from new with my 2006 Tuscan S Convertible . I'd had the two accessible chains adjusted but didn't solve the problem . In 2013 at 20k miles ,the matter came to a head when I took the car to Power for a bespoke map, Jason was not happy to run at high revs to perform the mapping . Since fixing the chain problem required the engine to be taken out , I thought ,sod it I'll get a rebuild and it might aswell be a 4.5 SuperSport and a few months later when it was available , a new anti-knock MBE ECU . The rebuild included the improved half time bearing, improved chain tensioner and numerous other enhancements . No chain problems since and the engine runs as smooth as silk 
IIRC some of the chains are tensioned by rotating the gear box with the block , but I may have got it wrong, I just paid the bill
IIRC some of the chains are tensioned by rotating the gear box with the block , but I may have got it wrong, I just paid the bill
No specific info, but timing gear failure isn’t something the Speed Six is known for. It’s a relatively simple and robust setup. Halftime bearing replacement/upgrade should be a part of any rebuild though. I suppose that’s why we don’t see it as a particular problem. Other stuff fails well before it, triggering the full rebuild, including the replacement of that.
Targarama said:
There is some kind of bearing at the top/front which wears, my old 350T engine made an awful knocking under heavy load. Str8Six fixed it as a known issue to them (with an improved part). If you leave it you will lunch the engine. So for info I suggest calling Jason.
That’s the halftime bearing.Its the early cars where there were chain failures I am interested in. I am familiar with the HT bearing and its apparent weakness, but also if anyone who has an HT bearing failure could reply I'd really appreciate it, especially if this was in a steel crankshaft engine, but let me know either way 3.6/4.0/steel crank (not all RR or S had steel cranks so if you don't' know no probs, let me know what you know pls)
Cheers J
Cheers J
I wasn't aware of any chain failures .. we had lots of engines out of cars when I worked at the dealership but can't remember that there were any chain failures in there .. I just remember the cam/follower issues. It can't have been a big issue or we would have heard much more about it, and other than this topic I can't remember anyone saying they'd had a chain issue (as distinct from a HT bearing issue ).
Be interesting to see if anyone knows anything .. it's all part of the sp6 history if so.
Be interesting to see if anyone knows anything .. it's all part of the sp6 history if so.
Ummhhh. Bumped into someone who had helped someone who had trouble with one of these. Headline was snapping crankshaft nose at high revs. In depth questioning didn't reveal much, suspected the usual "Trouble engines those, stick to a push rod iron motor" attitude but it wasn't quite like that. basically it wouldn't hold cam timing at high engine speeds and eventually it snapped the nose off.
What I don't know is;
Model/year/crank material/capacity (although suspect 4L)/revs attempted.
The engine builder is pretty clued apparently hence he saved it a couple of times when it started to loose cam timing, how he saved that I don't know. I don't know the end result other than he stays clear of the SP6 now. I do know it left his shop with a different damper on the nose,
My chain question wasn't triggered by my hearing about this, it stems form my doubting the ability of ADI as a performance crankshaft material (despite there being a lot of people with much bigger brains than me writing things that say different) and the reported chain failures in early engines and the still current HT bearing failures. The early engines didn't have a long nose, they didn't have an HD fitted, all of the timing cases I have seen have been modified at the factory with a hole drilled and an oil seal with a screwed on retaining ring. Some cranks were extended with a bolt on bit.... ummhhh nasty.
If anyone has experienced a chain failure, punch in what you know please.
Ta
J
What I don't know is;
Model/year/crank material/capacity (although suspect 4L)/revs attempted.
The engine builder is pretty clued apparently hence he saved it a couple of times when it started to loose cam timing, how he saved that I don't know. I don't know the end result other than he stays clear of the SP6 now. I do know it left his shop with a different damper on the nose,
My chain question wasn't triggered by my hearing about this, it stems form my doubting the ability of ADI as a performance crankshaft material (despite there being a lot of people with much bigger brains than me writing things that say different) and the reported chain failures in early engines and the still current HT bearing failures. The early engines didn't have a long nose, they didn't have an HD fitted, all of the timing cases I have seen have been modified at the factory with a hole drilled and an oil seal with a screwed on retaining ring. Some cranks were extended with a bolt on bit.... ummhhh nasty.
If anyone has experienced a chain failure, punch in what you know please.
Ta
J
Gassing Station | Speed Six Engine | Top of Page | What's New | My Stuff