Search found 151 matches

by Roh
Mon Jan 04, 2021 9:58 pm
Forum: General Discussion
Topic: Name that car
Replies: 63
Views: 5575

Re: Name that car

kees wrote: Mon Jan 04, 2021 7:38 amHotchkiss Anjou.
Close but no cigar!
by Roh
Mon Jan 04, 2021 2:45 am
Forum: General Discussion
Topic: Name that car
Replies: 63
Views: 5575

Re: Name that car

Image
by Roh
Tue Sep 15, 2020 1:56 am
Forum: Parts For Sale
Topic: Rusting A90 (541) wheel on ebay around £30
Replies: 19
Views: 3464

Re: Rusting A90 (541) wheel on ebay around £30

Photos of the Image wheel that was based on the wheel from eBay:

https://www.joc.org.uk/forum/viewtopic. ... 6&start=80" onclick="window.open(this.href);return false;
by Roh
Wed Aug 26, 2020 8:19 am
Forum: Cars For Sale
Topic: seeking SV8
Replies: 9
Views: 1323

Re: seeking SV8

https://www.joc.org.uk/forum/viewtopic.php?f=11&t=30678" onclick="window.open(this.href);return false;
by Roh
Fri Aug 21, 2020 10:51 pm
Forum: V-8 Engine Tech
Topic: Inlet/exhaust port matching - worth it?
Replies: 25
Views: 3533

Re: Inlet/exhaust port matching - worth it?

Probably the most common gasket compressed thickness would be 0.040". So it is straight forward to go with zero deck height (pistons flush with deck) and 0.040" head gaskets, which gives a good quench height of 0.040". You could use the same approach with any gasket between 0.039 to 0...
by Roh
Fri Aug 21, 2020 11:25 am
Forum: V-8 Engine Tech
Topic: Inlet/exhaust port matching - worth it?
Replies: 25
Views: 3533

Re: Inlet/exhaust port matching - worth it?

I'd say 0.040" to 0.045" is a good range for quench height.
by Roh
Fri Aug 21, 2020 2:24 am
Forum: V-8 Engine Tech
Topic: Inlet/exhaust port matching - worth it?
Replies: 25
Views: 3533

Re: Inlet/exhaust port matching - worth it?

If you are going to skim the block to square it up, then you might as well ensure that the quench height is optimised. - It will increase the compression ratio which will help with energy efficiency and power as well as giving you more options when it comes to camshaft selection - It will improve qu...
by Roh
Fri Aug 21, 2020 1:26 am
Forum: V-8 Engine Tech
Topic: Inlet/exhaust port matching - worth it?
Replies: 25
Views: 3533

Re: Inlet/exhaust port matching - worth it?

You used to be able too buy some templates for the ideal port shape. Some one I know bought a set of heads that had already been ported and he reckoned the engine was a lot more free revving. If you are after a little more efficiency from your engine getting the compression close to 10 to 1 is a go...
by Roh
Thu Aug 20, 2020 1:22 am
Forum: V-8 Engine Tech
Topic: Inlet/exhaust port matching - worth it?
Replies: 25
Views: 3533

Re: Inlet/exhaust port matching - worth it?

An extreme example of how port mismatches may not make much of a difference relates to the Big Block Chevrolet (BBC). A square port inlet manifold has been proven to work very well on an oval port head. See the image to get an idea of the degree of port mismatch. http://www.usmuscle.com.au/Forum/att...
by Roh
Wed Aug 19, 2020 7:05 am
Forum: V-8 Engine Tech
Topic: Inlet/exhaust port matching - worth it?
Replies: 25
Views: 3533

Re: Inlet/exhaust port matching - worth it?

Pocket porting is well and truly worth the effort, but port matching commonly yields little to no improvement.
by Roh
Mon Aug 17, 2020 2:39 am
Forum: General Discussion
Topic: Name That Car
Replies: 1093
Views: 158735

Re: Name That Car

Image
by Roh
Wed Jul 08, 2020 10:25 pm
Forum: General Discussion
Topic: E10 Petrol
Replies: 16
Views: 2987

Re: E10 Petrol

Why would you need to run 98 RON unless you have a modified engine? I have run my Mk. 3 on NZ 91 RON for 16 years with no issues and I have a slightly increased comp. ratio (9.2:1 if I remember right!). I was actually thinking of the B motors that had a 10:1 compression ratio vs 8.2:1 for the RB mo...
by Roh
Tue Jul 07, 2020 11:13 pm
Forum: General Discussion
Topic: E10 Petrol
Replies: 16
Views: 2987

Re: E10 Petrol

That makes more sense.

Wouldn't most of you use 98 RON anyway? It won't be good if even the 98 RON has 5% ethanol in it.
by Roh
Tue Jul 07, 2020 9:39 pm
Forum: General Discussion
Topic: E10 Petrol
Replies: 16
Views: 2987

Re: E10 Petrol

Surely nobody runs a Jensen on 91 RON fuel?
by Roh
Tue Jul 07, 2020 2:21 am
Forum: Members' Cars
Topic: JLO 78K 128/4382
Replies: 58
Views: 11216

Re: JLO 78K 128/4382

A cool video showing the difference viscosity makes:
https://www.tec-science.com/wp-content/ ... cosity.mp4

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