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by camstevens
Mon Oct 12, 2020 6:43 pm
Forum: Four stroke
Topic: sq 4 oil pressure....
Replies: 15
Views: 1345

Re: sq 4 oil pressure....

simon.holyfield wrote:I use Penrite 25W/70 in my Mk1. 75 psi cold, independent of engine speed; 55 psi hot running; 25 psi hot idle.


Hi Simon
25w70 does sound like a prudent option. Did you run this grade when the engine was newly rebuilt? Would a higher viscosity at running temp help or hinder running in?

Cam
by camstevens
Tue Sep 29, 2020 7:56 am
Forum: Four stroke
Topic: New MK1 cam - have missed a trick?
Replies: 9
Views: 313

Re: New MK1 cam - have missed a trick?

Thanks John
Yes, I'll be setting the timing this weekend. I'll map out the profile using a DTI......will be interesting to see if the ramp is clear on the profile (prior to lift)........will revisit the advice sheet.

Regards
Cam
by camstevens
Sun Sep 06, 2020 7:34 pm
Forum: Four stroke
Topic: New MK1 cam - have missed a trick?
Replies: 9
Views: 313

Re: New MK1 cam - have missed a trick?

Thanks, understood

C
by camstevens
Sun Sep 06, 2020 6:03 pm
Forum: Four stroke
Topic: New MK1 cam - have missed a trick?
Replies: 9
Views: 313

Re: New MK1 cam - have missed a trick?

Thanks Johnny, I'm just being uber cagey this time. I do have the timing sheet which includes the required clearances....the cam I was given was old profile, but I had set the clearances to the later profile with loading ramps. I'm not sure that would have had a massive effect on performance, but wo...
by camstevens
Sun Sep 06, 2020 5:32 pm
Forum: Four stroke
Topic: New MK1 cam - have missed a trick?
Replies: 9
Views: 313

Re: New MK1 cam - have missed a trick?

Interesting. My lobes do not have the clean machines finish as shown in Paul's photo. My lobes themselves have the dull, grainy finish.

C
by camstevens
Sun Sep 06, 2020 4:56 pm
Forum: Four stroke
Topic: New MK1 cam - have missed a trick?
Replies: 9
Views: 313

New MK1 cam - have missed a trick?

Hi I've just recieved a replacement cam.....actually to replace an incorrectly profiled one I was sent (so had been running with incorrect clearances). Drags were good enough to honour the original purchase and replace it. There is something I'm not too sure about though; the cam lobes have a dull, ...
by camstevens
Sat Aug 29, 2020 9:11 am
Forum: Four stroke
Topic: MK1 Valve guide seals
Replies: 11
Views: 638

Re: MK1 Valve guide seals

If I understand correctly, the design Nev refers to would not require any retro machining. Could even be fitted with head in place?

C
by camstevens
Thu Aug 27, 2020 7:03 pm
Forum: Four stroke
Topic: MK1 Valve guide seals
Replies: 11
Views: 638

Re: MK1 Valve guide seals

That sounds sensible, and as per Simon's response I'm pretty certain my oil problems were not coming from above.
by camstevens
Thu Aug 27, 2020 5:33 pm
Forum: Four stroke
Topic: MK1 Valve guide seals
Replies: 11
Views: 638

MK1 Valve guide seals

Hi All I have my MK1 engine apart again to sort out some problems (was a heart-wrenching thing to have to do, but need to look forward positively as I've found the root causes). Whilst to the engine is apart, I'm considering having guide seals fitted and wondering what the general consensus was on t...
by camstevens
Wed May 27, 2020 6:03 pm
Forum: Four stroke
Topic: MK1 sump oil level
Replies: 4
Views: 361

Re: MK1 sump oil level

GuyWalton wrote: got running in oil in it now just need to use it


I wish I have used running-in oil from the get-go also. I'd be further down the road now.....literally :roll:

Campbell

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