Engine rebuilding - Please help

[cloeter]

I am currently rebuilding the engine, I replaced the standard crank with a 4mm Hotrod crank with 5mm long rods. The pistons I am using are the wiseco pro lite 1.5 mm oversize banshee pistons. I received a gasket set with the crank and conrods. My problem is as follows, when I installed all the components and after it I turned the magneto to find that the pistons are 3mm above the barrels and this will make the pistons hit the head. What I thought of then is to lazer cut 2 alluminium spacers which are 2mm thick and then place a gasket underneath and a gasket on top of the spacers which will be installed under the barrels. This will then lift the barrels enough. Is this the correct way or not? :shrug:

[jankab]

I am currently rebuilding the engine, I replaced the standard crank with a 4mm Hotrod crank with 5mm long rods. The pistons I am using are the wiseco pro lite 1.5 mm oversize banshee pistons. I received a gasket set with the crank and conrods. My problem is as follows, when I installed all the components and after it I turned the magneto to find that the pistons are 3mm above the barrels and this will make the pistons hit the head. What I thought of then is to lazer cut 2 alluminium spacers which are 2mm thick and then place a gasket underneath and a gasket on top of the spacers which will be installed under the barrels. This will then lift the barrels enough. Is this the correct way or not? :shrug:

You can either do that or get a set of cut domes that allow the piston to come above deck. I've seen it done both ways and IMO the cut domes work a little better. Here's a place that sells exactly what you're talking about doing.

http://www.vitosperformance.com/atv_parts/...&cat=200&page=1

[BigRed350x]

If you have the longrod crank you need to get Wiseco 795 series pistons to adjust for the longer rods. Then you will need a spacer plate or cut domes to accomodate the added stroke of the crank. Go with the cut domes.

[cloeter]

Thanx for the help guys :wink:

[kman96]

go with the the cut domes i kept blowing head gaskets with the stroker plate.

Edited June 23, 2006 by kman96

[cloeter]

What size domes do you guys recommend??

[fastbanshee8]

I'm running 19cc stroker domes in my Coolhead. PM Fastoys, and talk to Jeff. He will answer any of your questions, and will have the domes you need.

[BrockMoto]

If its not too late you should get the Wiseco piston made for long rods... Otherwise get some cut domes.

[BrockMoto]

If its not too late you should get the Wiseco piston made for long rods... Otherwise get some cut domes.

[BigRed350x]

If its not too late you should get the Wiseco piston made for long rods... Otherwise get some cut domes.

 

He will need both. The crank he is using has 1. longer rods and 2. longer stroke. You need to run a 795 series piston to accomodate the longer rod, then you need either cut domes OR a spacer plate to accomodate the stroke. The spacer plate gives a lot better top end, since it is moving your port timing up a lot higher, the stroker domes give more bottom end, since they are effectively moving your port timing lower. I run stroker domes in mine and it does good. The spacer plate is good for drag racing. Anything other than that I would stick with domes myself.

 

Dome size depends on if you want to run race gas or not. It depends on your compression. Get a hold of Patriot Racing, they got my domes cut and shipped to my door cheaper than anyone else I talked to. Make sure you have your bore, and deck height before you contact them though. Deck height is the more important number.

 

Hope that helps.

Edited June 25, 2006 by BigRed350x

[cloeter]

Thanks for the help guys, much appreciated :thumb: