Hi from down under

Discussion in 'introduce yourself' started by Shane oakhill, Jan 16, 2017.

  1. Shane oakhill

    Shane oakhill Phat 49

    hi , My name is Shane, i just wanted to say g'day , long time reader, love the site and fact that it's real world information and experience . I like the fact that I can want information on one topic but three hours later I forgot what I originally wanted and am sifting through materials totally unrelated, keep up the good work.
    I do have some questions on different cams and gearing sets as I am changing a few things on my 400 Chev in the quest for a bit more power specifically mid range hp.
    Thanks for the ad
     
    Last edited: Jan 17, 2017
  2. Grumpy

    Grumpy The Grumpy Grease Monkey Staff Member

  3. Shane oakhill

    Shane oakhill Phat 49

  4. Shane oakhill

    Shane oakhill Phat 49

    Thanks Grumpy,

    Heres a few of my 1949 Chevy Pickup.
    I will ask some questions on my 400chevy in the engine forum.
    Thanks Shane
     
  5. DorianL

    DorianL solid fixture here in the forum Staff Member

    Welcome to the madness, Shane. That's a stunning ride you have there!

    I had a 400 for many years and I miss it to bits. Finding quality headers that are large enough is one of the issues I had.
     
    Shane oakhill likes this.
  6. Strictly Attitude

    Strictly Attitude solid fixture here in the forum

    Welcome aboard I see you have been looking around with out tethering up first. Be careful it can lead to project snowballing!!
     
    Shane oakhill likes this.
  7. Shane oakhill

    Shane oakhill Phat 49

    Thanks Dorian, it's a work in progress. Someone else started it and i am changing it to my tastes, probably would of been cheaper to start from scratch but I can still enjoy the truck while I change little things as compared to it sitting in s shed on jacks.
    The 400 is good and I have to finish setting up the rest of the vehicle to suit. Bigger flowing headers is next , and I think I have just found an elusive 3.77 gear set for my jag rear end more suited to the existing lunati cam , which might change the way I progress with the build.
     
    Last edited: Jan 18, 2017
  8. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

    Welcome Shane.
     
  9. Indycars

    Indycars Administrator Staff Member

    Not sure how I missed this, that one nice truck! Got any pics of the engine?
     
  10. Shane oakhill

    Shane oakhill Phat 49

  11. Shane oakhill

    Shane oakhill Phat 49

    Hi Rick, here are a few of the engine before install and just after. I have since added a 1' phenolic spacer and 1'super sucker. The headers have been heat wrapped also but new 1 3/4 long tube header are coming after Xmas to go with the compression upgrade and new Cam. The heads are Dart SHP 64/200cc which are also going to be port matched to the manifold and opened up a bit. AFR 195s would be ideal but not in the budget just yet.
    Unfortunatly i was a bit niave first build around and bought some mismatched combo parts from the person who was going to build the engine first. he turned out to be not what i thought and wanted to use inferior parts and not balance the rotating assembly which for even me waved a red Flag so i decided to part ways.
    My current engine builder built the engine with the inherited parts as i was under pressure from the wife to stop spending,;)which really was just the wrong piston dish size which netted me , its good for about 400-420hp . But.... i was under the assumption that it would be 460-480 which would put me where i wanted and still have a reliable streetable engine. It ran a best of 13.1 @104mph with a newby drag racer behind the wheel. Mid 12s would make me happy. We are going to put in 7cc forged flat tops which with the head gasket and final quench we are aiming for close to 11.1 give or take depending on final assembly. That compression should match the Crower 00471 , my 3000 stall and my 4.09 rear gears. I run a 28'' tyre on the street and 26 et street at the drags.
    Gearbox is a built T700r4 and i would not trade the overdrive for anything.
    I have not heard or could not find anyone who actually has the cam in question so was very interested in your thoughts and real world experiences. Thanks for the video link , much appreciated and makes me very excited to get the second phase of the engine sorted.
    Can i ask what engine vacuum your combo makes?
     

    Attached Files:

  12. Grumpy

    Grumpy The Grumpy Grease Monkey Staff Member

    that looks like a nice clean and well laid out engine combo.
     
  13. Indycars

    Indycars Administrator Staff Member

    Job well done on the engine, looks terrific!

    I figured my SCR was 10.7 and that was with a 5cc flat top piston. But more important is the DCR,
    which figured to be 8.27. I have run into some problems with detonation on 91 octane (100% gas).
    What octane do you plan on running? How will you install the camshaft, that will have a significant
    effect and determine the Intake Valve Closing angle (IVC) and therefore your DCR.

    CompressionRatios.JPG

    I have the 200-4R trans with the overdrive and I feel the same way. It's the best thing since canned beer. :cool:

    You know, it's been a couple of years since I put a vacuum gauge on the motor. I'm not sure. I bet
    Grumpy will have a good idea what that would be.
     
  14. Shane oakhill

    Shane oakhill Phat 49

    I figured my SCR was 10.7 and that was with a 5cc flat top piston. But more important is the DCR,
    which figured to be 8.27. I have run into some problems with detonation on 91 octane (100% gas).
    What octane do you plan on running? How will you install the camshaft, that will have a significant
    effect and determine the Intake Valve Closing angle (IVC) and therefore your DCR.

    Not sure about the installation of the cam, i have not thought about that to be honest. Down here every petrol station sells 98 which i think is the equal of the 95 you can buy in America. Most probable dot to dot will work for me. I will look into it and the advantages/disadvantages of advancing/retarding the camshaft.
    I just imputed my details into united Engines DCR calculator and this is what it calculated.
    My initail calculations of DCR puts me at 9.1 and SCR at 10.89 which worries me . Maybe i am imputing something wrong, your intake valve closing point is 69 Rick yet the calculator tells me to add the intake closing point at .050 and add 15 degress which gives me 59.
    If i use 69 i am at 8.44DCR but 59 puts me at 9.1 DCR !!!
     
  15. Indycars

    Indycars Administrator Staff Member

    Adding 15° is an approximation for the IVC if you don't have the manufactures numbers ..... 69° is directly from the Crower cam specs for their 00471 camshaft, it just has to be calculated.

    Yes I agree that 44° ABDC + 15° = 59 IVC .... but it's an approximation.

    IVC_Crower00471.JPG

    Use the calculator link below (2nd tab labeled "IVC Angle Calc -2") . If you don't have the software, then I can do it for you. Yes it is a calculator that I programmed in Excel, but it allows you to compare 5 engines side-by-side, where the online calculators leave it up to you to write the numbers down manually for every iteration.

    Note: There are several numbers that have negligible effect ("1st tab labeled "DCR Calculator -1") that they can be ignored. None the less they are technically are a part of the calculation and I like to be exact.

    Use the 2nd tab to calculate the IVC, the (2nd tab labeled "IVC Angle Calc -2").

    http://garage.grumpysperformance.co...comp-ratio-cranking-pressure-calculator.4458/


    Crower_HR_00471_555_560.JPG
     
  16. Shane oakhill

    Shane oakhill Phat 49

    Thanks for the spreadsheet Rick, very interesting to play around with the figures. After ccing my new pistons this afternoon and imputing the information i have so far come up with a rough projected figure of 10.80 static compression and a DCR of 8.37 which should be fine with the premium fuel available here. My pistons advertised 5cc valve relief in the catalogue, said 7cc on the box and when i measured them came to 6.5-7cc which will work better for me to bring the compression down on both the static and dynamic.
    Of course nothing is set in stone until the engine is pulled down , heads touched up and cc'ed, measurements taken. But i have learnt something over the last few days that will make a better engine and for that i thank you. will keep you posted.:)
     
    Last edited: Dec 3, 2017

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