hollisatp Posted August 13, 2008 Report Posted August 13, 2008 Can some one explain what this is and what is needed for this kit? Thanks! Quote
hollisatp Posted August 13, 2008 Author Report Posted August 13, 2008 sorry also a 4mm engine? Just curious.. Quote
jbooker82 Posted August 13, 2008 Report Posted August 13, 2008 To build a 4 mill long rod you will need the following parts. Hot Rods Long Rod 4 mill stroker crank Wiseco 795 Series piston (they have the wrist pins moved up 5 mm for the 5 mm longer conecting rod) It has nothing to do with the stroker part of the crank. You would still need these pistons if you were going to run a Stock Stroke Long Rod crank. Stroker Domes, OR a 2mm spacer plate. The pisotns move down 2mm farther in to the cylinders, and Up 2mm higher out of the cylinders. So you need to some how space the head 2mm up. You lift the jugs up 2mm by placing the spacer plate between them and the cases the head moves up 2mm. Or you can run a cool head with domes that are machined an extra 2mm so the pistons wont hit them. The Stroker domes in a cool head is the best way to go. It is a lot better idea than sticking a spacer plate under the cylinders. Port work is recomended but not required. josh Quote
elwilliams13 Posted August 13, 2008 Report Posted August 13, 2008 Just had a 4mil done and I went with the stroker domes. All you need are the 795 series pistons from wiseco, the stroker crank, I used the hotrods long rod one. and either coolhead with the +2 stroker dome or the spacer plate. As stated above porting optional. I had mine ported because I heard it is the way to extract max power from the setup. Quote
hollisatp Posted August 13, 2008 Author Report Posted August 13, 2008 so on the wiseco site there is a long rod stroker kit and a long rod kit 5mm. Whats the difference? I think that going with the domes is the best also, does noss make these? And if they are only 2mm milled out, where does the other 2mm of room come from? do I need to mill out my case? Thanks for the info.. Quote
dajogejr Posted August 13, 2008 Report Posted August 13, 2008 (edited) The other 2 mil comes from the bottom of the stroke...it's not going to shoot out of the bottom of the engine... That's precisely why the porting should be matched. You are changing the timing on when the piston passes over the intake and exhaust ports to get fuel/air in and out.... Just to be clear...a stroker crank has a longer stroke. Stock is 54mm from TDC to BDC. 4 mil is 58mm. A long rod is an actual rod longer than stock.... Stock is 110mm, the common long rod is 15mm, of course there are other sizes. You get a piston with a different height wrist pin to accomodate the long rod. What a long rod does is put the connecting rod at less of an angle, so it doesn't want to push the piston through the front of the cylinders as much. What a stroker does is increase the size of the motor by moving the piston further up and further down...as well as allowing more air/fuel as a result of this longer stroke. As said...for a stroker crank, you need to put a spacer under the cylinders or have the domes cut to have the pistons travel 2mm up into the head... Both are common... I prefer domes because a spacer plate gives another spot for an air leak. On wiseco's site, Racer's Choice are the pistons you want....if you're going to use the long rod crank. Otherwise, use standard pistons... The pistons are the same for a long rod stroker crank as they are a long rod stock stroke crank. Edited August 13, 2008 by dajogejr 1 Quote
duneblazer Posted September 8, 2008 Report Posted September 8, 2008 The other 2 mil comes from the bottom of the stroke...it's not going to shoot out of the bottom of the engine...That's precisely why the porting should be matched. You are changing the timing on when the piston passes over the intake and exhaust ports to get fuel/air in and out.... Just to be clear...a stroker crank has a longer stroke. Stock is 54mm from TDC to BDC. 4 mil is 58mm. A long rod is an actual rod longer than stock.... Stock is 110mm, the common long rod is 15mm, of course there are other sizes. You get a piston with a different height wrist pin to accomodate the long rod. What a long rod does is put the connecting rod at less of an angle, so it doesn't want to push the piston through the front of the cylinders as much. What a stroker does is increase the size of the motor by moving the piston further up and further down...as well as allowing more air/fuel as a result of this longer stroke. As said...for a stroker crank, you need to put a spacer under the cylinders or have the domes cut to have the pistons travel 2mm up into the head... Both are common... I prefer domes because a spacer plate gives another spot for an air leak. On wiseco's site, Racer's Choice are the pistons you want....if you're going to use the long rod crank. Otherwise, use standard pistons... The pistons are the same for a long rod stroker crank as they are a long rod stock stroke crank. Well said! :thumbsup: Quote
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