Clearance and compression ratio video(s)

Discussion in 'Mech Tech' started by Sproggy4830, Sep 10, 2022.

  1. Sproggy4830

    Sproggy4830 Supporter

    . Ive just watched this video on clearance and compression ratio.
    The commentators speaks at around twice as fast as normal, however what do people think . Is the video a good example of what / to do the task.
    I have loads of books on the rebuild of the vw type 1engine but i learn better from being shown or watching a video . i tend to loose interest if i read how to do it and forget it to quickly.
    Anyone have a favourite youtube video you watch on rebuilding that you call upon to remind you how to do it .

    Any suggestions welcome
     
  2. @Barry Haynes will be along shortly and i think you and the Mod's are going to regret this thread:lol:
     
    Sproggy4830 and Zed like this.
  3. Jake Raby has produced some decent videos on VW aircooled engine rebuilding.
     
  4. Don't think that's particularly good, as they're using non-stock stuff.

    There is a series on YouTube of a guy in the US building a type 1 in his mum's garage - pretty good. I'll try and find a link.
     
    Sproggy4830 likes this.
  5. mikedjames

    mikedjames Supporter

    There is a fair bit of messing around dealling with clearancing things for a non-stock crankshaft with a longer throw, (but he never mentioned having to check the camshaft to make sure that it misses the conrods as well) , he comes in half way through the whole story.

    As a result there is not so much detail on checking the combustion chamber volume and the deck height.
     
  6. Sproggy4830

    Sproggy4830 Supporter

    Looks as though i. Choose a bad example , thank you all. Theres a lad called CT who does a good guide over a few videos, he does sound so fed up and depressed though .
    .
    Also a vwdarrin does similar videos .
     
    Last edited: Sep 11, 2022
    mikedjames likes this.
  7. mikedjames

    mikedjames Supporter

    I found vwdarrin good.. its worth watching a few then you get the sequence so that you dont have to sit there with a book in one hand... five pages blow over and you wonder why the pistons are missing later on..
     
  8. Sproggy4830

    Sproggy4830 Supporter

    Below is the engine number i have on the unknow history engine that i have , i understand theres a way of establishing details of the engine using the letters and numbers but i cannot decipher it.
    the details look like HV098877 , looking closely , half hidden by the nut on the left had side appears to be a faded number 8 or is it a letterB

    Its a twin port engiine, as ive previously said i bought it off a lad who bought his bus to convert to electric and he has no idea of what the engine is(he imported it fron south africa)

    can any light be thrown on this please




    Screenshot 2022-09-13 at 15-34-36 Amazon Photos.png



    theres one other stamp on the block which i dont know if it has any significance, its a letter B stamped just below the distributor.

    Screenshot 2022-09-13 at 15-39-33 Amazon Photos.png
     
  9. Sproggy4830

    Sproggy4830 Supporter

    Heres a pic of full engine for reference


    PXL_20220913_141948898.jpg
     
  10. Zed

    Zed Gradually getting grumpier

    It's a 50 year old Type-1 engine. By this time whatever is stamped on the block probably means nothing.
    If you look underneath you'll see if it's single or dual relief by checking if it has 1 or 2 of the big "screw" covers on the relief plungers. Either way even that hardly matters unless you intend turning it into a high revving drag motor.
    Really, after those 50 years the only way to truly know what you have is to take it to pieces, check the piston size, the crank throw and the cam lift. Having said that, odds are that whatever it started out as it's now a stock 1600-ish dual port.
     
    snotty likes this.
  11. mikedjames

    mikedjames Supporter

    Its a twinport engine probably a 1600 or 1641.

    Because of the way you can upgrade these engines based on the same engine case.. it could be one of several upgraded sizes. However the lack of anything other than a stock carburettor on top means its probably a basic 1600/1641 engine.


    You do a 1641 upgrade because it costs exactly the same as a 1600 for pistons and cylinders and there is no machining needed ..

    A badly set up 1641 can be a lot weedier than a well set up 1600 so you cannot really tell without measuring a piston diameter which it is.
     
  12. Sproggy4830

    Sproggy4830 Supporter

    i am hoping its a 1600 , as my previous one is a 1600, i am off to the Doncaster vw festival this weekend then i intend to extract the engine , measure the freeplay and take it to pieces, not split the case just yet though untill i seek advice on what i find removing pistons
    i have used the engine only to move the van from neighbours drive to my drive , it was leaking oil all over and its covered in oil , i dont want to just run the thing blind, i want to strip it and re build then i know what i have exactly. i dont mind spending a few bob on it ( from the wifes swear box) so i am looking forwards to working on it ,
    ive just got to move vehicles about and make room in garage to work on engine then i will report back.

    other than new P&B, to make it a 1641 would i need anything else changing such as distributor or carburettor (even if its just different jets) .
     
  13. Zed

    Zed Gradually getting grumpier

    You should be fine to transfer everything from your current engine over.
     
  14. Sproggy4830

    Sproggy4830 Supporter

    Problem with my old engine Zed is piston and barrel for number three are completely shot , it was a brand new set of piston and barrels as one of my original old barrels was also shot but i didnt have any others so i bought a new set . I am rather hoping that my remaining three barrels that have done around a thousand miles , will match up with one of the remaining seven barrels i will have. i am concious that measurements will have to match up but at the moment its not possible to tell . I idealy would lke to buy just One brand new piston and Barrel but thats not possible unless someone has one hanging about for whatever reason . I am happy for it to remain a 1600 engine as the very brief look around ive just had regarding changing to 1641 seems its not realy of any benefit , so if i can make a set of barrels up from what i have already i will remain as a 1600.
     
  15. Zed

    Zed Gradually getting grumpier

    If you end up using different make pistons, they may be different weights. In that case keep 2 the same opposite each other for example use one make for 1 & 3 and the other make for 2 & 4. This is better than one odd weight one. Obviously keep the barrels with their pistons.
    Alternatively if you had an odd one that was just a few grams heavier than the others you could lighten it to match. But if you have an odd one that's lighter you're a bit stuffed though if they weren't far out you could lighten 3 to match it.
    Hope that helps - what you do not want is one piston being an odd weight.
    The other thing to watch out for is not having different length barrels on the same side which kind of goes against the above advice, but if it was me I wouldn't worry too much about running one make piston in another make barrel if they measure up the same diameter.
    I'm sure you'll work something out.
     

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