mazfg Posted August 25, 2011 Share Posted August 25, 2011 As an aside to the recent problems I was having with my carbs I also checked the compression of each cylinder, with (my dads) very old smiths compression tester. these are the results I got, going from no.1 to no.6 cylinder140, 160, 140, 160, 165, 140The is this ok, haynes manual says high C 143 and low C 129 . The tester isn't exactly calibrated...I also, whilst looking through the old car handbook, noticed that the order of firing and denoted plugs is different to the haynes manual. haynes says no.1 plug is next to the radiator, but the handbook shows no.1 by the bulkhead??? Cheers Link to comment Share on other sites More sharing options...
Mark Hammond Posted August 25, 2011 Share Posted August 25, 2011 3398 wrote:I also, whilst looking through the old car handbook, noticed that the order of firing and denoted plugs is different to the haynes manual. haynes says no.1 plug is next to the radiator, but the handbook shows no.1 by the bulkhead??? CheersReally? It must have moved then.Mark Link to comment Share on other sites More sharing options...
mazfg Posted August 25, 2011 Author Share Posted August 25, 2011 Which is right?Here's the picture in my handbook:The leads still go to the same places, although the Haynes manual shows the distributor slightly different in position to that... Link to comment Share on other sites More sharing options...
mazfg Posted August 25, 2011 Author Share Posted August 25, 2011 So when I set up my dynamic timing....am I attaching the strobe trigger lead to no.1 or no.6?? Link to comment Share on other sites More sharing options...
junkuser Posted August 25, 2011 Share Posted August 25, 2011 "but the handbook shows no.1 by the bulkhead"Sounds like that's a Jaguar handbook. Link to comment Share on other sites More sharing options...
Clive Posted August 25, 2011 Share Posted August 25, 2011 number one is at the front of the engine, that is where you pop the strobe on. But you may need to adjust it by ear after, the book figures rely on the old 4star petrol, new components etc. I always advance the dizzy until I get pinking under load, then retard enough to the point where I just get no pinking. Link to comment Share on other sites More sharing options...
GT6 M Posted August 25, 2011 Share Posted August 25, 2011 Out of curiosity, doo it on both 1 and six, also 2/5 3/4 reson, I have had distributors that are a few degs out, mainly on 1/6 wont hurt to test.with the old electronic disc ones, you could alter the spark point by making the slots bigger or smaller. so if you on that type, you no how to doo it noo.are those figs not a bit low,!!!! Marcus Link to comment Share on other sites More sharing options...
mazfg Posted August 26, 2011 Author Share Posted August 26, 2011 junkuser wrote:"but the handbook shows no.1 by the bulkhead"Sounds like that's a Jaguar handbook.Nope, definately my Triumph Vitesse handbook....."are those figs not a bit low,!!!! " , my figures or the ones I quote. Below is the excerpt from the haynes manual: Link to comment Share on other sites More sharing options...
nang Posted August 26, 2011 Share Posted August 26, 2011 Pressures arn't 100 percent but should be ok.How have you got plug leads though. As has been said No1 is at the front of the motor and from there 1 5 3 6 2 4 in an anti clockwise direction..I wonder if this is some of your problems ?Cheers Tony. Link to comment Share on other sites More sharing options...
mazfg Posted August 26, 2011 Author Share Posted August 26, 2011 nang wrote:Pressures arn't 100 percent but should be ok.How have you got plug leads though. As has been said No1 is at the front of the motor and from there 1 5 3 6 2 4 in an anti clockwise direction..I wonder if this is some of your problems ?Cheers Tony. It's ok, the car is running fine...I was just wondering why the 2 books are different. My distributor position looks more like the handbook picture, rather than the haynes....but both pictures kinda show the plugs going to the same positions on the dizzy. Link to comment Share on other sites More sharing options...
junkuser Posted August 26, 2011 Share Posted August 26, 2011 "Nope, definately my Triumph Vitesse handbook"Maybe written by an ex-Jaguar man.Don't know why Jaguar numbered that way, possibly just wanted to be different to "the common herd". Link to comment Share on other sites More sharing options...
JohnD Posted August 26, 2011 Share Posted August 26, 2011 Two books different because the compression gauges used to measure were different.As you say in your OP, the gauges aren't calibrated, so you cannot compare the figure from one guage to another.It's the numbers across the block that are important, and your indicate acceptable wear.Worth doing a further check after tipping a teaspoonful of engine oil into the spark plug hole, and turning the enhine over a few times. The oil will help seal leaky bpiston rings and raise the compression, whereas if there is a valve leak the oil will have no effect.And the way you do the tests is critical. ALL plugs must be out, throttle wide open, engine hot.And where you start the bore count is irrelevant in respect to compression - the number is merely for reference, as nio ignitoopn is involved in measuring compression.For ignition, where you start is important, and the convention is from the front. The picture in your manual is wrong. Looks like a Triumph engine, not a Jagaur, so which book is that that makes such a howler?John Link to comment Share on other sites More sharing options...
mazfg Posted August 26, 2011 Author Share Posted August 26, 2011 The photograph is from my Handbook, the second drawing from the Haynes manualSo handbook is wrong!I'll try the engine oil in the holes test this weekend too Link to comment Share on other sites More sharing options...
heraldcoupe Posted August 26, 2011 Share Posted August 26, 2011 It's convention with Triumph engines that number 1 cylinder is at the front of the engine. In truth, what they're called makes little difference in most respects as Triumph used a balanced firing order, reverse the cylinder numbers and it simply shifts the order by 180 degrees. I've never noticed the reverse notation in any of the original literature before, but I tend to do more with 4-cylinder than 6-cylinder engines.Ford place number 1 at the back end of the engine. In their application it seems to be more of an issue as they use a different firing order, but I try not to trouble myself with what Ford think is a good idea.....Cheers,Bill. Link to comment Share on other sites More sharing options...
.thumb.jpeg.b15b81ef10abeea1c3039ae03c4a9f3a.jpeg)
Recommended Posts
Archived
This topic is now archived and is closed to further replies.