hcci test

[breezy]

well ive had this kicking around for a while now and as im locked down seemed a good idea to have another look



had been originally inspired by flettner with his engine.( stole his starter set up). looks as though the piston rings in the adjustable combustion chamber are not sealing well enough to hold the required compression to fire up even with different types of fuel..https://youtu.be/9WzcnZaeYxw. i decided to put an outlet above the cylinder head piston to test the seal.....the piston ring set up has failed miserably where to go next? maybe a seal set up like that in a brake caliper with rubber seals. still need to fabricate a test system to test the head whilst its off. although ive started to make a simple cylinder head with a glow plug fitted to see if i can get the thing to fire up with rc fuel just to spur me on../

[TZ350]

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Very Interesting. I would love to see more as your project progresses.

[breezy]

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Very Interesting. I would love to see more as your project progresses.

hello tz, got a few more pictures to post and videos... tried to tag them onto my first post but the video links kept failing, but i will try again

[breezy]

https://youtu.be/_Q4r6hQ5NsY https://youtu.be/KpJxgvEYZ98 i did couple it up with a small motor to move the piston but once the piston rings were fitted the motor was no longer able to move the piston up and down in a controlled manner. picture of erg valve to keep the hot gaseinside the barrel. this was original drawing for building the head.

[breezy]

made a simple head for the engine today.... static compression 15:1 with a rc glow plug... see if i could get that to fire up.....it caught a couple of times but just not enough... i think pulley on the motor needs to be larger to spin the engine over faster...i was using rc fuel nitro methane through the carb...

[Flettner]

Breezy, should it have a carbutetor?

[breezy]

Breezy, should it have a carbutetor?

well, im not sure .. there was a lot of residue coming out the exhaust port.. as though it was very rich. i think that a single rc glow plug probably wasn't sufficient for the amount of fuel entering the cylinder. The cylinder has very poor ports, no real blow down to speak of. maybe a spray bottle would atomise the fuel delivery better . im a bit stuck at present as i need a larger pulley wheel to get it spinning up faster. Ive recently had a massive clear out of my garage and all my junk has been binned or given away. . But although it only chugged a few times im almost certain its almost there.. the compression is certainly there that's for sure. my adjustable piston cylinder head is probably not sealing very well due to my poor machining technique..i think i may try using the piston the rings came with see if that will seal... waiting on a few feabay bits to arrive to make a pressure tester, save keep fitting it then taking it off .... more to come..

[Niels Abildgaard]

well, im not sure .. there was a lot of residue coming out the exhaust port.. as though it was very rich. i think that a single rc glow plug probably wasn't sufficient for the amount of fuel entering the cylinder. The cylinder has very poor ports, no real blow down to speak of. maybe a spray bottle would atomise the fuel delivery better . im a bit stuck at present as i need a larger pulley wheel to get it spinning up faster. Ive recently had a massive clear out of my garage and all my junk has been binned or given away. . But although it only chugged a few times im almost certain its almost there.. the compression is certainly there that's for sure. my adjustable piston cylinder head is probably not sealing very well due to my poor machining technique..i think i may try using the piston the rings came with see if that will seal... waiting on a few feabay bits to arrive to make a pressure tester, save keep fitting it then taking it off .... more to come..

With 1:15 compression ratio and rich mixture You will get north of 200 bar max pressure if it HCCIes.

[speedpro]

Not for long

[breezy]

i was kind of hoping it would fire up and die... asap.. pretty sure this engines big end wouldn't last too long with the high compression ratio.. i have attached the paper i read some time ago now....

[lohring]

Model engines have been successfully built with this system for a long time. They use a fuel that is 1/3 ether, 1/3 kerosene, and 1/3 lube oil. See the below links for more information.

https://www.flyrc.com/make-your-own-...nversion-head/
http://www.cafes.net/doctordiesel/

Unfortunately, Robert Davis, the founder of Davis Diesel, has died.

Lohring Miller

[breezy]

thanks lohring for these links, helpful to see how to fuel this kind of set up.... i have looked at the fueling i had tried, sort of off the cuff ,without any in depth look at the implications... i can see now why the engine spinning system im using began to labour significantly due to the increase in combustion pressure. as speed pro said " not for long".....

[trevor amos]

Crikey Nigel is there nothing you won`t tackle?
Great to see you keeping your hand in with all this obscure technical stuff, I wish you every success with HCCI you may well succeed where other failed, inspiring stuff your doing .

Cheers, Trevor

[breezy]

Trevor, good to hear from you, its been a while. im a bit bored at present so im playing with my last little engine... got it to fire up today with the help of easy start..then my lashed up direct motor to engine linkage failed..... ran for a split second...should have set my phone camera up before, so its not recorded. still im happy....i recently got rid of all my bike bits and usefull scrap metal so im struggling to keep the project moving.
keep safe mate..

[breezy]

Had another play with nitro/petrol mix with igniter head 15:1 comp...sort of fires /run no extensive run time though..my variable comp head is causing me issues with sealing at tdc.... just trying again to address this..little you tube vid to add..