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Thread: hcci test

  1. #1
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    30th April 2011 - 04:57
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    hcci test

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

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    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../

  2. #2
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    18th May 2007 - 20:23
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    Very Interesting. I would love to see more as your project progresses.

  3. #3
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    30th April 2011 - 04:57
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    Quote Originally Posted by TZ350 View Post
    .
    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

  4. #4
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    30th April 2011 - 04:57
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    hcci...couple of videos showing piston .

    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.Click image for larger version. 

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ID:	345150 picture of erg valve to keep the hot gaseinside the barrel.Click image for larger version. 

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ID:	345151 this was original drawing for building the head.

  5. #5
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    Click image for larger version. 

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ID:	345270 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...

  6. #6
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    12th March 2010 - 16:56
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    Breezy, should it have a carbutetor?

  7. #7
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    30th April 2011 - 04:57
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    Quote Originally Posted by Flettner View Post
    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..

  8. #8
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    Quote Originally Posted by breezy View Post
    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.

  9. #9
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    Not for long

  10. #10
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    30th April 2011 - 04:57
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    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....Click image for larger version. 

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  11. #11
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    28th August 2015 - 00:01
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    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

  12. #12
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    30th April 2011 - 04:57
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    fuel

    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".....

  13. #13
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    7th September 2011 - 00:26
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    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

  14. #14
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    30th April 2011 - 04:57
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    hcci

    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..

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