Martini 914 1974, restoration thread Options

[falcor75]

It wasnt overfilled, had the oil level at the top mark.

Pulled the plugs and they look ok to me.

https://www.dropbox.com/s/bu05qkitwwhod ... 0.jpg?dl=0
Cylinder 1 to the left and 4 to the right.

Did a compression test and got some varying results: 8,5/10/8/10,5.
Average value of 9,25 +/- 10% on that would give the range 8,3-10,2 so slightly outside of a 10% variation.

[porschetub]

It wasnt overfilled, had the oil level at the top mark.

Pulled the plugs and they look ok to me.

https://www.dropbox.com/s/bu05qkitwwhod ... 0.jpg?dl=0
Cylinder 1 to the left and 4 to the right.

Did a compression test and got some varying results: 8,5/10/8/10,5.
Average value of 9,25 +/- 10% on that would give the range 8,3-10,2 so slightly outside of a 10% variation.

Had you "run" the engine in before the dyno attempt?

[falcor75]

It wasnt overfilled, had the oil level at the top mark.

Pulled the plugs and they look ok to me.

https://www.dropbox.com/s/bu05qkitwwhod ... 0.jpg?dl=0
Cylinder 1 to the left and 4 to the right.

Did a compression test and got some varying results: 8,5/10/8/10,5.
Average value of 9,25 +/- 10% on that would give the range 8,3-10,2 so slightly outside of a 10% variation.

Had you "run" the engine in before the dyno attempt?

No because I havnt done anything to the engine.

[Puebloswatcop]

It's hard to tell from the video as my speakers suck, but it almost sounds like a valve issue. I was watching your first drive video and since it was in March it looks like the emissions from the exhaust pipe was just steam and I didn't here the horrible sound. Do you still have sound after the dyno run? Not sure on these little engines (but in a V8) I would certainly consider that you may have floated a valve.

Good luck and keep us posted. Hope it isn't all that serious. I have been following your build and the car is beautiful....It would be a real shame to have to do a complete engine.

[DavidSweden]

Sorry to hear you have engine problem, lets hope it can be easily fixed

[porschetub]

It wasnt overfilled, had the oil level at the top mark.

Pulled the plugs and they look ok to me.

https://www.dropbox.com/s/bu05qkitwwhod ... 0.jpg?dl=0
Cylinder 1 to the left and 4 to the right.

Did a compression test and got some varying results: 8,5/10/8/10,5.
Average value of 9,25 +/- 10% on that would give the range 8,3-10,2 so slightly outside of a 10% variation.

Had you "run" the engine in before the dyno attempt?

No because I havnt done anything to the engine.

Sorry assumed you had overhauled it,backtracking I found this wasn't so.
Puebloswatcop made a good point on valve float,hell it could be a broken or weak valve spring,did the noise sound like a clatter and did it subside after the RPM dropped?.
Hope you find a relatively easy solution.

[falcor75]

It wasnt overfilled, had the oil level at the top mark.

Pulled the plugs and they look ok to me.

https://www.dropbox.com/s/bu05qkitwwhod ... 0.jpg?dl=0
Cylinder 1 to the left and 4 to the right.

Did a compression test and got some varying results: 8,5/10/8/10,5.
Average value of 9,25 +/- 10% on that would give the range 8,3-10,2 so slightly outside of a 10% variation.

Had you "run" the engine in before the dyno attempt?

No because I havnt done anything to the engine.

Sorry assumed you had overhauled it,backtracking I found this wasn't so.
Puebloswatcop made a good point on valve float,hell it could be a broken or weak valve spring,did the noise sound like a clatter and did it subside after the RPM dropped?.
Hope you find a relatively easy solution.

Yes the noise did go away again when the rpms went down. My driveway is uphill so I had to start the car up to get it back inside when I got home from the dyno and it started up as normal with no unusual sounds.

[Puebloswatcop]

You may have a weak valve spring which at high RPM is floating a valve. I would do another compression check though and see what that comes out to. Definately don't want to drive it hard until you can track down the problem, if you drive it at all.

Have the valves been adjusted to be sure they are correct? Sorry, without being there to actually hear the sound it is making it is hard to nail down what it might be, so I am just throwing out ideas.

Good Luck

[Puebloswatcop]

Any update on your unfortunate engine issue? (IMG:style_emoticons/default/confused24.gif)

[falcor75]

Havnt had much garagetime but I've pulled the engine tins and measured the compression again with slightly better results now that I can see what I'm doing. Going to borrow a leakdown gauge and check that too. I've checked the valve clearances and they are ok. Oil was fine, no particles of any kind in it. Changed the valve cover gaskets. Found that the shrink wrap on my spark plug temp senders had melted so I've ordered new ones with a better spec.

[falcor75]

Well that was fun.....

Just did a leakdown test, it should be done with the engine warm but that wasnt an option at the moment.

Cylinder 1: 15% - most of the air going into the crank case
Cylinder 2: 11% - most of the air going into the crank case
Cylinder 3: 40% - most of the air passing the inlet valve
Cylinder 4: 13% - most of the air going into the crank case

Now spot the offender..... (IMG:style_emoticons/default/sheeplove.gif)

[Puebloswatcop]

Well that was fun.....

Just did a leakdown test, it should be done with the engine warm but that wasnt an option at the moment.

Cylinder 1: 15% - most of the air going into the crank case
Cylinder 2: 11% - most of the air going into the crank case
Cylinder 3: 40% - most of the air passing the inlet valve
Cylinder 4: 13% - most of the air going into the crank case

Now spot the offender..... (IMG:style_emoticons/default/sheeplove.gif)

Ouch (IMG:style_emoticons/default/sad.gif)

[falcor75]

When one door slams shut in your face you break out the wallet and smash down a wall.....

Engine is out of the car, heads are off, cant see anything wrong with them.

So screw this....I'm going big! (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/w00t.gif)

[r_towle]

Six?
Big four?
Subaru?
Chevy?
Other?

[falcor75]

Big four. (IMG:style_emoticons/default/smile.gif)

[raynekat]

Big four. (IMG:style_emoticons/default/smile.gif)

It will be great Mats.
Hang in there....

[falcor75]

Thanks Rayne...I figured that if I did a top end overhaul I'd still have a bottom end that I had no idea of the condition of. So...breaking out my spare 1.7 and sending it off to get a bit bigger. 2-3 months waiting time tho so this summer is sadly quite screwed.

Oh well there's Always beer... (IMG:style_emoticons/default/drunk.gif)

[falcor75]

Oh yeah, one of these will go into my Engine...probably the right hand one (IMG:style_emoticons/default/wub.gif)
(Photo Jacob Spring @ GBOT)

[76-914]

Sorry about the leak down results, Matt. 40% is huge. I'm surprised it didn't reveal itself once the heads were off. Was the head making good contact with that jug? Even if you dropped a ring or spaced them wrong I wouldn't expect 40% leak down! Regardless, good luck with your new build and do let us know what you find wrong with the old one. (IMG:style_emoticons/default/beerchug.gif) Kent

[falcor75]

Well while the engine is still being built my mate Pontus and I decided to tackle the paint.
First polish and wax since it was painted about 18 months ago. What a difference it made! The downside of the polishing is that all the imperfections in the paint are much easier to spot and there are a few....

First pass was made using a fine medium-fine pad and a coarse compound, seconds pass using a fine pad and fine compund. All of the Rupes brand including the machine. Good stuff! (IMG:style_emoticons/default/smile.gif)