Author Topic: 1/3rd scale V10  (Read 224264 times)

Offline keith5700

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Re: 1/3rd scale V10
« Reply #300 on: September 23, 2017, 08:20:44 AM »
Roger, the other bank of cylinders was fairly evenly discoloured. There's obviously a problem with the black one. Hopefully a snapped ring or something. The oil runs from the heads down 5 evenly spaced drain holes on the outer side of the block.
I have a 3 pronged attack planned at the moment. I'm going to shield the sides of the block so the crank can't whip up the oil from the side as it runs down. Then I'll fit a windage tray in the sump for similar reasons.
Thirdly I'm going to fit some better oil control rings. I was hoping George would have invented a ring design which solved his oil problem by now. Sorry if you have and I've missed it George.

I came up with a design which I'm happy with yesterday. I'll get some pics up later.

Cam timing is 106 atdc inlet, 250 a tdc ex. It would be great if the lack of power turned out to be a cam timing issue.

Terry, oil pressure is a fairly low 25psi. Oil is 0-30. I did have 20-50 in at the start, so I've had the full range in at some point.
Immaculate work right back to you too sir.

Any suggestions always welcome. I still do daft things occasionally. Last week I spent a frustrating hour with it only running on 8 cylinders. After multiple plug changes it turned out I'd got 2 of the coil packs the wrong way round, after a plug lead change!

Offline Roger B

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Re: 1/3rd scale V10
« Reply #301 on: September 23, 2017, 08:36:19 AM »
What's the cam profile? You describe grinding from a master template but I can't see the opening angle mentioned. As a quick check is there an obvious overlap between the inlet opening and the exhaust closing at TDC?
Best regards

Roger

Offline keith5700

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Re: 1/3rd scale V10
« Reply #302 on: September 23, 2017, 11:29:36 AM »
Roger, I'll have to check my figures, but they're at work at the moment. From memory I took the timing and overlap figures from a mild Comp Cams profile. I think it was their 224 grind but might have been the 214?

Offline keith5700

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Re: 1/3rd scale V10
« Reply #303 on: October 11, 2017, 01:10:29 PM »
Sorry for the delay. I got sidetracked making some 1/3 scale suspension pieces.
I can't find much about the cam timing figures but this is a graph I plotted at the time, which shows some overlap, but not much.
I suppose I could resurrect the variable cam timing idea if this made any difference. All the basic mechanism is there apart from an actuator.


Offline Roger B

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Re: 1/3rd scale V10
« Reply #304 on: October 11, 2017, 02:41:15 PM »
Looking at that graph by the time you have lost a little motion to the valve clearance there will be no overlap. I would first check with a dial gauge and a degree wheel that you have something like the graph. If so I would try reducing the angle between the two opening points to 200 and see if that makes a difference. Hopefully there should be enough movement in your vernier adjusters.
Best regards

Roger

Offline keith5700

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Re: 1/3rd scale V10
« Reply #305 on: October 11, 2017, 03:55:41 PM »
Will do. I'll draw up the actual curves rather than look at this theoretical one. cheers.

Offline Vixen

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Re: 1/3rd scale V10
« Reply #306 on: October 11, 2017, 04:45:17 PM »
Maybe an idea to check as many cylinders as possible, especially the unusual colored ones.

Mike
It is the journey that matters, not the destination

Offline keith5700

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Re: 1/3rd scale V10
« Reply #307 on: October 11, 2017, 06:17:25 PM »
The engine is coming apart in a week or so. I've come up with a, hopefully, good idea for an oil ring, so if I can make a batch of these then they'll get fitted.
Photos soon if all goes well.

Offline 777engman

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Re: 1/3rd scale V10
« Reply #308 on: October 13, 2017, 03:34:36 AM »
Hi, I am wondering if you have drilled some small oil return holes in the piston behind the oil control ring?? we did this on a few full size diesel engines that used oil from new, fixed it with no further issues. just a thought. as for power maybe put a degree wheel on the cams and check the actual timing relationship with the crank and make sure they are the same for each bank and each cam, and obviously the right spec.
cheers
Dean

Offline keith5700

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Re: 1/3rd scale V10
« Reply #309 on: October 24, 2017, 08:39:27 AM »
Hi Dean, sorry I missed your reply.
Yes I could try drilling the Pistons and using the existing rings, but dismantling the engine is going to be a right pain, so if I'm doing it I may as well try my new oil ring design at the same time.
The Pistons will get drilled though with my new rings.
I will be checking the cam lifts/timing etc. But at the end of the day, even if they are exactly what my spec says there's no guarantee that is the best spec for this engine. The best profile could be vastly different to what I have.
Cheers.

Offline michelko

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Re: 1/3rd scale V10
« Reply #310 on: December 18, 2017, 12:05:09 PM »
Hi Keith,
fighting nearly the same Problems with the Bugatti. I found some info about timing on an old plan from the westburry SEAL. Maybe its helpfull?

Michael

Offline keith5700

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Re: 1/3rd scale V10
« Reply #311 on: December 28, 2017, 01:51:00 PM »
Thanks Michael, it was helpful.

I've not done much with the engine recently, since I got it running again after its strip down.
I've decided to build a 1/3 scale RC car to put it in, so I've made a start on that.
Been struggling with photobucket lately but I think I've got a couple of photos uploaded, I'll just see if it works.
I think it's best if I start a new thread in the vehicle section, so hopefully a full description of my plan will be up soon.




« Last Edit: December 28, 2017, 01:56:52 PM by keith5700 »

Offline keith5700

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Re: 1/3rd scale V10
« Reply #312 on: December 28, 2017, 01:55:24 PM »
Well that didn't work very well, but one of the photos got through. I need another photo host before I start another build thread. PB drives me nuts.
« Last Edit: December 28, 2017, 02:08:32 PM by keith5700 »

Offline fumopuc

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Re: 1/3rd scale V10
« Reply #313 on: December 28, 2017, 04:01:43 PM »
Hi Keith, WOW.
Great start of the rear suspensions.
Missing the camber adjustment shims.
I think the push rod in the last picture is not finished yet ?

Kind Regards
Achim

Offline agmachado

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Re: 1/3rd scale V10
« Reply #314 on: December 28, 2017, 04:23:56 PM »
Very nice !!!

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