ok, quick vid of timing chain in action.... not the most interesting youtube video ever.. but maybe of interest to someone on here...

https://youtu.be/ZV_VPymjBuU

So my strange whirring/scraping noise is not caused by oil deprivation....

The other thought i have is that the cam bearing could be spinning in the block... is this likely ?

good idea, why didnt i think of that !?!
tried it, refilled the sump with oil, took out the plugs, put in some wire and a switch between battery and solenoid so i could stand at the front and operate it.

oil coming through quite nicely , not spraying about all over the place but being layed onto the chain.
Couldnt hear the noise from before over the starter motor. but at least oil is there.


tried to upload a video..... how do you do that ?

Hi, looking for advice...

Rebuilt my A14 engine with a new block (old one had vertical scores in the bore caused by a loose gudgeon pin.)

Started the rebuilt engine up, everything working fine, ran it for about 20 mins on two occasions, temperatures fine and electric fan cutting in and out regularly- everything looking good.

Then a few days later i started her up and got a whirring./scraping sound coming from the front. first thought was alternator bearing, so removed fan belt and ran engine but still had the same noise.

used my big screwdriver to my ear and tracked the noise down to coming from near the camshaft pulley.

Removed the timing chain cover, suspecting that i had forgotten to tighten the camshaft pulley bolt and it had come loose and chain scraping somewhere. Cant see any marks where anything was scraping, but i noticed a distinct lack of oil, either on the timing chain or behind the camshaft retaining plate, and the inside of the timing cover dry also.
The slinger was fitted...
oil pressure warning light goes out as soon as the engine runs.

what can i do next ?

Thinking about putting the timing chain and crank pulley back on and running it without the timing cover to see if oil is getting in there, but will i cover myself and my garage with oil if i do that ?

is there a way to pressurise the oil system without the engine running so i can see whats happening ?

I upgraded to a crank fired system as i was having trouble with pinging.
I used a Nodiz unit, simple and easy to install, i used the supplied curve.
Before i couldnt rev past 4000 rpm, but now i can co all the way to 6800 where the rev limiter cuts in.

thanks, edited post to change units to be PS...

Took my modified engine to the same dyno today.
This is the same A14 engine but:

A15 crank
77mm Mazda UC pistons
Camtech cams 621 cam
dual valve springs
nodiz crankfired ignition (wasted spark)
C/R 10.5:1 (from memory, need to check that)
38DGAS Weber carb on std manifold
tubular headers 38mm dia

max PS 92.46@5950 rpm (previously 57.7)
max torque 128.38 at 4500 rpm(previously 98.39)

This is using the supplied curve that came with the ignition, i couldnt get the bluetooth connection to work to fiddle with the curve.

Very pleased with the result.

Attach file:

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  dyno test feb1 2017 001.jpg (33.02 KB)

ok, thanks for responses, i'll have a look at the slack and try adjusting it.
be nice to have a simple problem for a change

i have A15 with 60A 5 speed box and standard cable clutch.
Normally the clutch and gear change action is fine, but after a period in traffic or engine idling for a while and the electric fans are working to keep it cool it gets difficult to get in gear, grinds the teeth to get into reverse.
Why is this ? and can i just adjust it out ?

I have one you can have, but i'm in Thailand so shipping cost mount up.
If you get no joy otherwise then call me and we can see what we can sort out

Andy

See this link for standard new weber jetting
http://www.racetep.com/webercarbjet.html

My friend recently fitted the 32/36 to his standard A15 and hes happy with it, bought the jetting kit also but had no need for it.

I bought a 38DGAS at the same time for my slightly built A15 and that works fine with the std jetting also.

Just make sure you follow the weber tuning instructions to the letter, dont think you know best and fiddle with it willy nilly, follow the instructions.
http://www.redlineweber.com/html/Tech ... set_up_and_lean_best_.htm