Search found 874 matches

by Clifford Pope
Tue Sep 22, 2020 8:04 am
Forum: Engine
Topic: Auxiliary oil feed to rockers
Replies: 12
Views: 277

Re: Auxiliary oil feed to rockers

That's my point - it limits the upper pressure, but it cannot compensate for low pressure caused by worn bearings or too free a flow up the bypass pipe?
by Clifford Pope
Mon Sep 21, 2020 2:49 pm
Forum: Engine
Topic: Auxiliary oil feed to rockers
Replies: 12
Views: 277

Re: Auxiliary oil feed to rockers

I'm not sure that the oil pressure regulator literaly does that - surely it simply limits the maximum pressure - it can't increase oil pressure to compensate for increasing bearing tolerances? As those of us who in the old days of optimistically screwing the adjuster to try and compensate for worn b...
by Clifford Pope
Mon Sep 21, 2020 7:40 am
Forum: Engine
Topic: Auxiliary oil feed to rockers
Replies: 12
Views: 277

Re: Auxiliary oil feed to rockers

But it's not an extra little trickle. The supply to the valves is designed to be at a much lower pressure than in the main oil gallery, because the internal feed is taken from a main bearing where the crank has a flat on part of its surface. So the feed from this journal only pulses once per revolut...
by Clifford Pope
Mon Sep 21, 2020 7:24 am
Forum: Engine
Topic: Distributor fitting
Replies: 3
Views: 130

Re: Distributor fitting

I have noticed a tendency for the clamping system to be a bit marginal - everything has to absolutely undamaged, and the section of the distributor that the clamp engages is only just wide enough for the clamp - any distortion or burring in the clamp or the profile of the clamped part of the distrib...
by Clifford Pope
Wed Sep 02, 2020 7:12 am
Forum: Engine
Topic: Manifold Heater Pipe
Replies: 11
Views: 692

Re: Manifold Heater Pipe

An exhaust heat exchange with a thermostatic flap diverter would give almost instant heat and then turn off when the job was done. Agree on para 1 above. Have any experience of doing the requirement for para 2 or perhaps the necessary parts? Kev [/quote] No, just observation of a fairly standard ar...
by Clifford Pope
Tue Aug 11, 2020 8:24 am
Forum: Engine
Topic: 'Orrible modern fuel
Replies: 5
Views: 651

Re: 'Orrible modern fuel

and it turns out some of the temperature increase in the fuel comes from valves left open when the engine stops and combustion chamber residual heat leaks back towards the inlet manifold and carbs. Suffice to say there is a lot more to this than I thought. That would be one advantage of having an e...
by Clifford Pope
Thu Aug 06, 2020 6:37 am
Forum: Engine
Topic: Mechanical Fuel Pump Differences
Replies: 4
Views: 438

Re: Mechanical Fuel Pump Differences

Aren't there two different kinds depending on camshaft - the lever engages with the camshaft in a different way, I thought?
Also gasket thickness alters the movement of the lever surely?
by Clifford Pope
Thu Aug 06, 2020 6:34 am
Forum: Engine
Topic: Manifold Heater Pipe
Replies: 11
Views: 692

Re: Manifold Heater Pipe

Does the pipe run through solid aluminimum, not through manifold air space? If so, then the tightness or quality of the seal would not matter. But its purpose is presumably to supply heat to the air intake as soon as possible after start-up. In which case it would surely work better with a good heat...
by Clifford Pope
Wed Aug 05, 2020 9:22 am
Forum: Engine
Topic: Knocking on start up
Replies: 11
Views: 1093

Re: Knocking on start up

Yes, filter manufacturer (not make) can make a difference. I think we may have a forum member who used to work for Perkins and did some R&D work with filters. Hope he chips in. I think it is David Withers. I remember a thread some years ago about filter theory, in which he explained that filters ar...
by Clifford Pope
Wed Aug 05, 2020 9:09 am
Forum: Engine
Topic: Manifold Heater Pipe
Replies: 11
Views: 692

Re: Manifold Heater Pipe

I think Joe is talking about the manifold heater pipe, not the car heater pipe. I've just been out to look at mine. I hadn't taken any notice of this before, but I see there is a steel pipe running right through both branches of the inlet manifold. It does look the sort of set up I can imagine being...