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Re: VHPD Engine inspection

Posted: Thu Jan 09, 2020 7:35 pm
by winthattt
I have made a bit more progress and checked the mechanical valve clearances, it was a pretty easy task. I turned the engine over with a long socket wrench on the belt pulley and when the cam was 180 Degrees away from the cam follower I checked the clearance. People have reported that it's hard to get a feeler gauge in but there is plenty of space. I only had imperial gauges so they should measure 10 thou and 12 thou for the inlet and exhaust in old money. They are absolutely nothing like that, only four are close to correct and all the rest are tighter, some as small as 5 thou. It's not a major problem but they will have to be shimmed to get the correct measurements. I was also worried that the cam pulleys did not look aligned as the K series workshop manual suggests. After a quick check with Dave Andrews of DVA power fame he tells me it's correct for a 190 VHPD. That's worth knowing for anyone else who is a VHPD novice. I'm going to continue pulling it apart and get Dave Andrews to shim the valves (assuming everything else is OK).

Correct cam alignment for a VHPD.

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Checking the clearances.

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Cams are marked Piper and are different exhaust and inlet (at least marked differently)

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Re: VHPD Engine inspection

Posted: Fri Jan 10, 2020 8:35 pm
by deggles
winthattt wrote:
Thu Jan 09, 2020 7:35 pm
I was also worried that the cam pulleys did not look aligned as the K series workshop manual suggests. After a quick check with Dave Andrews of DVA power fame he tells me it's correct for a 190 VHPD. That's worth knowing for anyone else who is a VHPD novice.
Very good point this, it seems even some 'experts' don't know. My car at some point got reverted to standard timing which I only realised at the last cambelt change (courtesy of the eagle-eyed Byron, our friendly neighbourhood Lotus master tech :geek: ) Standard timing shown in the photo for comparison, but note also the correct white alignment marks on the left hand pulley and the cam cover :P
IMG_20161008_173045.jpg
Enjoying this thread, thanks for sharing :thumbup:

Re: VHPD Engine inspection

Posted: Fri Jan 10, 2020 9:44 pm
by thommo
Fascinating
👍

Re: VHPD Engine inspection

Posted: Fri Jan 10, 2020 10:32 pm
by tlracer
The alternative timing mark came to mind when I posted earlier but, as I haven't yet fitted the 190 pulley I acquired recently I didn't want to give out inaccurate info. However this thread has (a) reminded me to fit it and (b) been hugely useful in fitting it correctly!

Re: VHPD Engine inspection

Posted: Sat Jan 11, 2020 8:21 pm
by winthattt
The plot thickens for my car, even though the pulleys are correctly aligned the cams most certainly are not, the inlet and exhaust cams are closely aligned, opening both valves at the same time. I’m in conversation with Dave Andrews and he thinks some Muppett has put the cam wheel on the wrong roll pin. You can see the inlet and exhaust lobed pointing up. I thought something was odd. It’s certainly never run like that.

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Re: VHPD Engine inspection

Posted: Sat Jan 11, 2020 8:28 pm
by winthattt
winthattt wrote:
Sat Jan 11, 2020 8:21 pm
The plot thickens for my car, even though the pulleys are correctly aligned the cams most certainly are not, the inlet and exhaust cams are closely aligned, opening both valves at the same time. I’m in conversation with Dave Andrews and he thinks some Muppett has put the cam wheel on the wrong roll pin. You can see the inlet and exhaust lobed pointing up. I thought something was odd. It’s certainly never run like that. Muppett is my definition, Dave is too polite.

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Re: VHPD Engine inspection

Posted: Sun Jan 12, 2020 8:43 pm
by winthattt
Even though it’s all coming apart, I have ordered a camlock tool so I can get the pulley bolts off and see what’s wrong. Progress stopped until it arrives!

Keith

Re: VHPD Engine inspection

Posted: Mon Jan 13, 2020 11:05 am
by tlracer
deggles wrote:
Fri Jan 10, 2020 8:35 pm
Very good point this, it seems even some 'experts' don't know. My car at some point got reverted to standard timing which I only realised at the last cambelt change (courtesy of the eagle-eyed Byron, our friendly neighbourhood Lotus master tech :geek: ) Standard timing shown in the photo for comparison, but note also the correct white alignment marks on the left hand pulley and the cam cover :P
IMG_20161008_173045.jpg

Enjoying this thread, thanks for sharing :thumbup:
I'm slightly confused here...the photo appears to show both pulleys on standard alignment marks, yet the dowel appears to be in the additional '190 slot'?

Re: VHPD Engine inspection

Posted: Mon Jan 13, 2020 4:00 pm
by dris
tlracer wrote:
Mon Jan 13, 2020 11:05 am
deggles wrote:
Fri Jan 10, 2020 8:35 pm
Very good point this, it seems even some 'experts' don't know. My car at some point got reverted to standard timing which I only realised at the last cambelt change (courtesy of the eagle-eyed Byron, our friendly neighbourhood Lotus master tech :geek: ) Standard timing shown in the photo for comparison, but note also the correct white alignment marks on the left hand pulley and the cam cover :P
IMG_20161008_173045.jpg

Enjoying this thread, thanks for sharing :thumbup:
I'm slightly confused here...the photo appears to show both pulleys on standard alignment marks, yet the dowel appears to be in the additional '190 slot'?
I was about to post the same until I looked back on photos from mine before fitting verniers.......it was the same set up as Keith's.

Re: VHPD Engine inspection

Posted: Mon Jan 13, 2020 4:37 pm
by winthattt
According to Dave Andrews mine is correct with left pulley "exhaust" mark at 12 and the right pulley "exhaust" mark at 9. However my pulleys are probably on the wrong slots/dowels on the cams. I suspect my engine had verniers on it at some stage and when they engine was removed the old pullies where bunged on (literally) and they are in the wrong place. Once I have the cam tool I'll remove the bolts and check and them get a correct picture of the cams aligned and the pullies on the correct roll pins.