Yanmar - How long should it take for oil pressure to come up from a cold start?

[Frosty]

Oh yeah, Thanks for that, nice to now some one else has the problem --in some strange kinda way. The petrols being less makes sense and confirms the diagnosis.

[WestVanHan]

*****Suffice it to say that the 90* V6 is an engineering abomination, one that (I doubt) we will ever see made in Germany .
Jimbo********

Sorry to rain on your parade Jimbo:

The Mercedes of 1997 M112 family was/is a 90 deg. V6 using a balance shaft and offset crank pins.
But they overlapped the pins so maybe half of the pin area overlaps.
Evolved into the 3 litre still in production.

And Audi's 2.8 V6 of the early '90s was a 90 degree,as is the 2.7 turbo,2.8,and the 3.0 and 3.2 of today.

Maserati was a 90,and the old F1 turbos had odd degrees for packaging.

Ford SHO/Yamaha had that 60 deg. V8 and Volvo/Yamaha has the 4.4 60 deg. V8.

[powerabout]

The only use for a V6 is a 2 stroke outboard motor either 60 or 90, odd fire or even any other use was designed by an accountant.
(Oops except for 6-53 & 92 Detroits)

[powerabout]

Does Yanmar actually make any engines or are they all somebody else's

Originally Posted by Jimbo1490

Richard (apex1) has demonstrated his (usual) engineer/designer's understanding of the reciprocating engine. Kudos!

Likewise for any V6 which posseses a bank angle which is a multiple of 60, ie 60, 120, or 180 degrees (a Porsche engineer once told me to think of the boxer engine as a 180* vee). These 6 cylinder engines are also in perfect balance.
Jimbo

Sorry, completely wrong! The Porsche engineer should have been sacked when going home to Stutgart!

A 180° engine is a Vee engine with 180° cyl bank, but working on the same crank with two cyl.s
A Boxer is a 180° cyl. bank engine working each on his own crank. For that reason the Boxer is balanced so nice.

And we all made the crappy 6vee´s. just to get them in to a cramped space. (except BMW)
Regards
RIchard

[masalai]

Frosty, - How is it going? - The engineering problems sorted, or still a work in progress?

For you, Mas, engineering is your Lay-Z-Boy chair. Get back in your "financialsense" hole. Seriously, you guys talk every waking moment in other threads. Why would you even post, "Frosty - How is it going?"?

[powerabout]

Apex1

How come flat 4 and 6 light planes engine vibrate so badly?

[FAST FRED]

"light plane"

Is the key to your question, With as little weight and mass that most fleas have the engine becomes a huge percentage of the mass.

Bolt that flea motor in a car as Tucker did , and the extra mass smooths everything out.

FF

[Pacey16]

Interesting post, talking of harmonics, could I remove the harmonic balancer from my Yanmar 4Jh3e (around 2002 vintage) and fit a second pulley in its place to run a second alternator, I think the previous model did not have a balancer.
I should probably leave it in place but fitting another pulley outside it looks like a major engineering job. maybe some company does a dual pulley I can mount behind the balancer in place of the original pulley.

Thanks.

[powerabout]

Do the major engineering, even adding the pully can make a change unless engineered by the factory.
I have rebuilt a few ( high Speed) engines that had extra kit on the front and was usually surprised how worn the front main bearing was compared to the rest.
These were not factory additions.
You would need to know the maths on the engine torsional vibration to know whether you will have no probs or maybe create them.
Maybe swap out for 2 aluminium pulleys the same weight as the original..
just an idea. thats my 2 cents

[Bigfoot1]

Adding an extra pulley, assuming that it is concentrically balance and it will be within tight tolerances, will not change, SIGNIFICANTLY, the harmonics of the engine. Keep the harmonic balancer in place as this will create a change due to its higher mass and inherent imbalance that is machined into it to help the engine vibrations

[Toddlesocks]

I had a 4k yanmar diesel generator. It took hours to start and then the pull start cord came off in my hand. I'd only ever managed to start it twice

[WestVanHan]

Apex has that one correct.....I missed that Porsche v180 comment.

Apex,I have an engine..tell me what this is-you should know:

6 cylinders and 12 pistons

[TollyWally]

Frosty,
I ran across this in my internet travels. It may be wholly impractical and have no relationship to what you are trying to accomplish but what the hell it doesn't cost any to look.

http://www.carcraft.com/techarticles...ild/index.html