fletch Posted July 12, 2016 Share Posted July 12, 2016 Yes but it's the acceleration that matters. Traveling up the bore then stopping and going back down is where all the force is. A longer rod reduces the peak acceleration of the piston. Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 12, 2016 Share Posted July 12, 2016 Someone graph it. 1 Quote Link to comment Share on other sites More sharing options...
Steelies Posted July 12, 2016 Share Posted July 12, 2016 A longer rod reduces the peak acceleration of the piston. Â do you mean longer stroke, like, bigger circle? Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 12, 2016 Share Posted July 12, 2016 Nah longer rod for same crank stroke  GRAPHSSSSSSS   The shorter the rod, the higher the peak acceleration. Hence the advantage of longer rods for a given stroke. 3 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 12, 2016 Share Posted July 12, 2016 Here's a page of science and graphs regarding this stuff  http://ftlracing.com/rsratio.htm Quote Link to comment Share on other sites More sharing options...
Ja1lb8 Posted July 12, 2016 Author Share Posted July 12, 2016 Yeah I have seen the dude in South Africa has a thick wall V57. He is the only one I have ever heard of finding one. I know some L builders have gone through 10s of LD blocks looking for decent thickness and not found any.  You are better off with a short rod in a road motor anyway. I can't see any need for the taller block unless you are going over 90mm stroke. Yea, thought I was onto a winner with the v57 block but no dice.Have heard of thick wall examples coming out of industrial appilacations, forklifs and gen sets. And yes Im well aware that using the l28 block would be much eaisier but i want to go bigger then 3.1l and looking more then 90mm of stroke. Sooo... have hacked up a few cranks,An RB30 and ld28 crank. Options are to offset grind using smaller journal rod, 45mm out of a honda that looked like it would work or new custom cank.I just installed a large churchill grinder in my workshop that should be suitiable this project i think? 1 Quote Link to comment Share on other sites More sharing options...
M.H. Posted July 12, 2016 Share Posted July 12, 2016 90mm stroke is still quite small. Any 100mm cranks available? Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted July 12, 2016 Share Posted July 12, 2016 Pics of grinder? 2 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 12, 2016 Share Posted July 12, 2016 90mm stroke is still quite small. Any 100mm cranks available?Compared to what? A Barra has a almost 100mm crank, but I don't think you'll be making that fit Quote Link to comment Share on other sites More sharing options...
Ghostchips Posted July 12, 2016 Share Posted July 12, 2016 Compared to what? A Barra has a almost 100mm crank, but I don't think you'll be making that fit i've seen 2 4cyliner cranks cut to make a 6 but it wasn't easy... /ling Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted July 12, 2016 Share Posted July 12, 2016 Just buy a fucking monster billet of steel, and spend a fews days non stop turning handles on a lathe. 1 Quote Link to comment Share on other sites More sharing options...
Ja1lb8 Posted July 12, 2016 Author Share Posted July 12, 2016 90mm stroke is still quite small. Any 100mm cranks available? Na, Stock l28 is 79mm ld28 is 83 and rb30 is 85mm which you can make fit with some machining as they have the same bore spacing, anything bigger then that and its gotta be custom made. Problem with the longer stroke is you run out of deck height to get a decent ratio. Also the bigger the throw on the crank the closer you get to side of the block. Just for a rough comparison heres a rb30(similar size to a l28) next to a barra 4.0l  http://s249.photobucket.com/user/ja1lb8/media/20160625_101418.jpg.html  And heres my grinder , havnt sat the grinding head back on it yet. Had to remove it get the weight down, think it comes in just over 4t And yes I know its a cylindrical grinder but its pretty easy to offset grind with these machines. http://s249.photobucket.com/user/ja1lb8/media/20160625_101418.jpg.html 1 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 12, 2016 Share Posted July 12, 2016 Just fit the Barra M8 1 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted July 12, 2016 Share Posted July 12, 2016 To a 240z? NaN! Quote Link to comment Share on other sites More sharing options...
kyteler Posted July 12, 2016 Share Posted July 12, 2016 High capacity churbro 6, sure Ford was 10-20 years late producing one but they did a good job when they finally did it. I'd put one in an S30Z. Probably not over an L31/2/3 though, simply because I love the sound of an L on triples. 2 Quote Link to comment Share on other sites More sharing options...
Ja1lb8 Posted July 13, 2016 Author Share Posted July 13, 2016 High capacity churbro 6, sure Ford was 10-20 years late producing one but they did a good job when they finally did it.I'd put one in an S30Z.Probably not over an L31/2/3 though, simply because I love the sound of an L on triples. The thought had crossed my mind. My zeds got an rb30 in it at the moment and can only just shut the bonnet so theres about 0 chance of getting a ford 6 in there. Was surprised how small the rods are in the ford engine. If you look at engine in the link above theres a mangled rod sitting on top that it spat out the bottom of the sump. Think its outa the earlier 240kw turbo ba falcon Quote Link to comment Share on other sites More sharing options...
M.H. Posted July 13, 2016 Share Posted July 13, 2016 The thought had crossed my mind. My zeds got an rb30 in it at the moment and can only just shut the bonnet so theres about 0 chance of getting a ford 6 in there. Was surprised how small the rods are in the ford engine. If you look at engine in the link above theres a mangled rod sitting on top that it spat out the bottom of the sump. Think its outa the earlier 240kw turbo ba falcon You need a vw vr6. Available in 3.6l and are the same length as a 4cyl. A mate is in the process of fitting one to his 260z Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted July 13, 2016 Share Posted July 13, 2016 VQ+T all day. Steal the motor out of Fletchs maxima. I wouldn't touch an euro engine. I was at a mates workshop today. 06 m spec with a blown clutch. Replacement parts are $5k. Fuck that all day. 2 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 13, 2016 Share Posted July 13, 2016 I wouldn't touch an euro engine.I'd touch an OM606, but little else. 1 Quote Link to comment Share on other sites More sharing options...
M.H. Posted July 13, 2016 Share Posted July 13, 2016 VQ+T all day. Steal the motor out of Fletchs maxima. I wouldn't touch an euro engine. I was at a mates workshop today. 06 m spec with a blown clutch. Replacement parts are $5k. Fuck that all day. Lol ok then i wont touch any jappa after seeing the cost of a trans rebuild for a gtr Quote Link to comment Share on other sites More sharing options...
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