Author Topic: 2 cylinder OHV 29ccm (Read 14468 times)

Perry · « **on:** September 30, 2014, 08:28:54 PM »

Hello
finaly, after some months, I've decided to contribute with some photos from my build.
Despite I started this project back in 2006 it is still not fully finished.

So , It was back in 2006 when I was strongly encouraged by my success with very first IC engine- webster, with some modifications.
I was very sure that I want to build another engine, so I took a paper,pencile and got in to sketching..

Inspired by "silver bullet" from Bob Shores I aimed for vertical 2 cylinder with exposed OHV, oil splash lubrication and water cooling.

photos to follow..

Peter

Perry · « **Reply #1 on:** September 30, 2014, 08:36:22 PM »

the first rough cuts being made, crankcase & cylinder block

Perry · « **Reply #2 on:** September 30, 2014, 08:42:24 PM »

Perry · « **Reply #3 on:** September 30, 2014, 08:48:28 PM »

lots of chips

Jo · « **Reply #4 on:** September 30, 2014, 08:59:51 PM »

It is amazing what engine parts you can find inside a piece of bar stock

Jo

Perry · « **Reply #5 on:** September 30, 2014, 09:05:39 PM »

Perry · « **Reply #6 on:** September 30, 2014, 09:25:46 PM »

Cylinder head

Perry · « **Reply #7 on:** September 30, 2014, 09:41:54 PM »

ups.. can't load more photos , hope I did not exceed some quota

b.lindsey · « **Reply #8 on:** October 01, 2014, 12:34:36 AM »

Perry, you could have hit the limit for a single post which is 10 MB. Generally you should reduce picture size to no more than 800 x 600 pixels which is more than enough to show detail on the forum. This will keep you from hitting the overall size limit and also helps out our members with slower connections. These mega-pixel sized photos simply take a lot of time to download and offer no advantage as to picture clarity or detail.

Bill

Roger B · « **Reply #9 on:** October 01, 2014, 10:58:38 AM »

Interesting build

Will the cylinder head be watercooled?

Perry · « **Reply #10 on:** October 01, 2014, 11:15:48 AM »

Quote from: b.lindsey on October 01, 2014, 12:34:36 AM

Perry, you could have hit the limit for a single post which is 10 MB. Generally you should reduce picture size to no more than 800 x 600 pixels which is more than enough to show detail on the forum. This will keep you from hitting the overall size limit and also helps out our members with slower connections. These mega-pixel sized photos simply take a lot of time to download and offer no advantage as to picture clarity or detail.

Bill

Hello Bill, thanks for explanation,
Can I re-upload downsized photos or should I open new topic now?
thx
Peter

Perry · « **Reply #11 on:** October 01, 2014, 11:19:58 AM »

Quote from: Roger B on October 01, 2014, 10:58:38 AM

Interesting build Will the cylinder head be watercooled?

Hi Roger
cylinder head does not have water passages, I was thinking a lot how to do that

but due to lack of skills at that time, I decided to go just with cooled cylinder block.

But as there are only two o-rings as head gasked, I guess that heat transfer from head to block is quite good.

Peter

b.lindsey · « **Reply #12 on:** October 01, 2014, 11:38:29 AM »

Perry,

I think you can edit your posts and delete the larger photos and replace them with smaller ones, however, I would leave them as is and just post downsized images in your future posts.

Bill

Perry · « **Reply #13 on:** October 01, 2014, 07:38:20 PM »

milling the grooves for o-rings - head gasket

Perry · « **Reply #14 on:** October 01, 2014, 07:41:14 PM »

pistons with two compression rings

Perry · « **Reply #15 on:** October 01, 2014, 08:02:33 PM »

One of the chalanges for me was to machine solid crankshaft and was a great satisfaction once finished

Perry · « **Reply #16 on:** October 01, 2014, 08:04:37 PM »

with flywheel and counterweights

Perry · « **Reply #17 on:** October 01, 2014, 08:10:35 PM »

cuting gears - module 1

Allen Smithee · « **Reply #18 on:** October 01, 2014, 08:12:57 PM »

I'm curious as to why you've made it a simultaneous-firing twin?

PDR

Perry · « **Reply #19 on:** October 01, 2014, 08:16:04 PM »

Camshaft was another first time experience.
The gear can be turned few deegrees agains the hub for fine adjustments.

Perry · « **Reply #20 on:** October 01, 2014, 08:25:18 PM »

Quote from: Allen Smithee on October 01, 2014, 08:12:57 PM

I'm curious as to why you've made it a simultaneous-firing twin?

PDR

hi Allen, while the pistons are traveling up and down together, valve timing makes them breath 360degrees of crank revolution apart
which means if 1st cylinder is in compression, the other is in exhaust cycle already. common for motorcycle paralel twin engines.

P.

Perry · « **Reply #21 on:** October 01, 2014, 08:30:19 PM »

yet another first time experience -split bearings for connecting rods

Perry · « **Reply #22 on:** October 01, 2014, 08:33:11 PM »

brass tappet-guide and steel tappet

Perry · « **Reply #23 on:** October 01, 2014, 08:37:38 PM »

some "work in progress" photos

Perry · « **Reply #24 on:** October 01, 2014, 08:45:06 PM »

waterpump with magnetic field driven impeller - inspired by drawings from Jerry Howell

Perry · « **Reply #25 on:** October 01, 2014, 09:11:06 PM »

that glorious and exciting moment when my scratch build engine started for the first time was well worth all the troubles I had during machining.

There were quite a few serious problems revealed during the first runs :

- really bad vibrations - I did not make any calculations and only estimated the counterweight size prior to first run
- arcing distributor and overheating ignition coil
- oil being pushed out of the one exhaust
- dragster-like fuel consumption

but all in all a success

<a href="https://www.youtube.com/watch?v=EFdKTwXDT4A" target="_blank">http://www.youtube.com/watch?v=EFdKTwXDT4A</a>

Jo · « **Reply #26 on:** October 01, 2014, 09:20:58 PM »

Well done

Jo

Perry · « **Reply #27 on:** October 01, 2014, 09:23:20 PM »

first necessary step was to balance rotating mass as good as possible.

while this is paralel twin, the same static balance rules apply just like for single cylinder.

calculating with 100% rotating mass +50% Reciprocating mass I've ended up with missing 80 grams at the counter weights ! ups..

Perry · « **Reply #28 on:** October 01, 2014, 09:24:04 PM »

Quote from: Jo on October 01, 2014, 09:20:58 PM

Well done

Jo

thanks Jo

Perry · « **Reply #29 on:** October 01, 2014, 10:26:20 PM »

most recent update report :

- crankshaft balancing prooved to be success

- brass fuel tank can now be bolted directly to engine as it is not shaking anymore, but is getting quite hot quickly -need thermal insulation insert/shield

- intergated "fuel constant level tank" is not working reliably, perhaps due to very thin tubes (capilars) used to keep it compact + as the fuel tends to heat up from engine quickly, raising internal pressure is pushing fuel out of the venting capilar

- distributor crossarcing was successfuly eliminated by rather thick black nilon insert.

- conventional ignition and breaker point was replaced by CDI unit with hall sensor from S/S Machine & Engineering -works great! very strong and reliable spark

- water pump does not work continuosly - will need to investigate

water cooler still needs to be finished
reliable fuel level control must be ensured - perhaps external float chamber

video of the latest run

<a href="https://www.youtube.com/watch?v=-Xmk6aKVdWA" target="_blank">http://www.youtube.com/watch?v=-Xmk6aKVdWA</a>

Perry · « **Reply #30 on:** October 01, 2014, 10:30:02 PM »

stevehuckss396 · « **Reply #31 on:** October 02, 2014, 12:26:50 AM »

Great job on the engine. She's rather large compared to the stuff I do. Looks and runs great. Congratulations!

fumopuc · « **Reply #32 on:** October 02, 2014, 05:11:09 AM »

Hi Perry, great job. Thanks for sharing all these pictures and showing the road you have gone. Good to know that also at this type of engines the counterweight calculation has to be done accurate.
(PS: nice E-type)

Allen Smithee · « **Reply #33 on:** October 02, 2014, 11:43:58 AM »

Quote from: Perry on October 01, 2014, 08:25:18 PM

hi Allen, while the pistons are traveling up and down together, valve timing makes them breath 360degrees of crank revolution apart
which means if 1st cylinder is in compression, the other is in exhaust cycle already. common for motorcycle paralel twin engines.

So no primary balance plus a fore-aft f/2 rocking couple? I suppose it could be sold to ladies via those shops with the blacked-out windows!

AS

b.lindsey · « **Reply #34 on:** October 02, 2014, 11:58:39 AM »

Nicely done Perry, Thanks for sharing the pictures and build log!!

Bill

Allen Smithee · « **Reply #35 on:** October 02, 2014, 06:53:53 PM »

Just an aside - is that an OS 61-sized carb (a 7D or similar) you're using there?

AS

Roger B · « **Reply #36 on:** October 04, 2014, 07:51:05 AM »

It runs a lot better in the second video

A nice job

What are the bore and stroke? (apologies if you have already mentioned this and I have missed it

)

Perry · « **Reply #37 on:** October 05, 2014, 07:16:33 PM »

thanks for nice comments

forgot to mention : Bore 25mm, Stroke 30mm

Carburetor is from some nitro rc airplane engine- not sure about the size..
once most of the bugs will be tuned out my plan is to make carburetor with more tuning possibilities such as Jerry Howel's carburetor or simmilar.

P.

Perry · « **Reply #38 on:** January 17, 2015, 12:23:58 AM »

Hi there, just a video update -
it was so nice outside during this winter days I just could not resist to give it a short run outside

<a href="https://www.youtube.com/watch?v=8gsPuUj0GLI" target="_blank">http://www.youtube.com/watch?v=8gsPuUj0GLI</a>

<a href="https://www.youtube.com/watch?v=mbKaZxTXpRw" target="_blank">http://www.youtube.com/watch?v=mbKaZxTXpRw</a>

b.lindsey · « **Reply #39 on:** January 17, 2015, 01:03:25 AM »

Seems to be a fine runner you have there Perry. Thanks for the videos!!

Bill

ths · « **Reply #40 on:** January 17, 2015, 02:46:29 AM »

A whole barrel of fun there Perry, nice engine. Cheers, Hugh.

fumopuc · « **Reply #41 on:** January 17, 2015, 04:57:32 AM »

Hi Perry, a very nice runner. Waiting for the whole set up with radiator and cooling system.

Longboy · « **Reply #42 on:** January 17, 2015, 06:36:58 AM »

"Its a runner" Perry....YOU WIN! Pleased to see. Dave

Coopertje · « **Reply #43 on:** January 18, 2015, 09:57:31 PM »

Very nice runner indeed, you can be proud

Regards Jeroen

90LX_Notch · « **Reply #44 on:** January 18, 2015, 10:56:57 PM »

Perry-

Well done. It runs well. It has to be such a fantastic feeling when your own scratch built I.C. engine runs well.

-Bob

Roger B · « **Reply #45 on:** January 20, 2015, 04:38:59 PM »

Looks and sounds good

The exhaust cleared nicely as it warmed up.

Perry · « **Reply #46 on:** January 20, 2015, 06:26:09 PM »

thaks all for comments

yes the smoke was gone as thet temperature rised which is great as I was unhappy with the excessive smoking

the evening before I start it up outside, I gave it a try in the workshop and this is what it looked like after 10 seconds

Jo · « **Reply #47 on:** January 20, 2015, 06:34:30 PM »

Quote from: Perry on January 20, 2015, 06:26:09 PM

I gave it a try in the workshop and this is what it looked like after 10 seconds

That is very dangerous.

The carbon monoxide builds up very quickly: it will first make you feel drowsy then suffocate you

We lost one of our guys many years ago in the time it took his mate to go and make a cuppa for the two of them

Jo

Perry · « **Reply #48 on:** January 20, 2015, 09:52:45 PM »

very sorry to hear that JO.
indeed, CO and and some workshop fumes are dangerous and unhealthy in general.

Art K · « **Reply #49 on:** January 29, 2015, 02:54:33 AM »

Perry,
Sorry I missed your thread earlier, then was busy and didn't get around to reading it. Good build, you have some clever touches like the angled roller rockers. Runs great, has sort of an agricultural tone to it, good job.
Art

rarach22 · « **Reply #50 on:** January 29, 2015, 06:02:00 AM »

Quote from: Perry on January 20, 2015, 06:26:09 PM

thaks all for comments

yes the smoke was gone as thet temperature rised which is great as I was unhappy with the excessive smoking

the evening before I start it up outside, I gave it a try in the workshop and this is what it looked like after 10 seconds

Hi,
Nice pictures.....škofin cesta a mobility. Pavel

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Author Topic: 2 cylinder OHV 29ccm (Read 14468 times)