My 97 SJ Motor build 85mm Flat Top*Done and Runs!!!*

[BROSS]

Did TJ say to install the sleeves before porting the transfer and boost ports?

How much material did you take off the top and do you know where you squish band gap is set at? :scratchchin:

The final deck hight is 4.520" I think and the domes will have to be machined a get the right squish around .045", if thats what you mean.

 

[#ZERO]

You shouldn't have to machine the domes at all on a flat top engine unless you're building a stroker?

So if my calculations are correct you just chopped 4.19mm of the cylinder surface and made the exhaust top deck height 35.56mm, depending on the depth of your counterbore.

You just made an awesome superstock engine, but I'm not sure it's going to run good for a freestyle setup on the bottom end.

 

[BROSS]

I'm pretty shure SS engines hit hard off the line, so why wouldn't be ok for freestyle?

 

[BROSS]

Did TJ say to install the sleeves before porting the transfer and boost ports?

Yes, he wanted the sleeves in to do all the work.

 

[#ZERO]

Usually superstock engines are a bit soft on the bottom end and hit extremely hard in the mid range with the top end more suited for racing.

This engine is going to hit real hard in the mid range, like someone turning the nitrous bottle on, if I'm correct.

Do you know what size flat top domes you're going to use, also what type of head do you have?

It's going to be harder to make the boost and transfer ports wider to match the NW sleeves with them installed.

 

[BROSS]

You shouldn't have to machine the domes at all on a flat top engine unless you're building a stroker?

So if my calculations are correct you just chopped 4.19mm of the cylinder surface and made the exhaust top deck height 35.56mm, depending on the depth of your counterbore.

You just made an awesome superstock engine, but I'm not sure it's going to run good for a freestyle setup on the bottom end.

Piston compression height= 1.258", wiseco
Piston deck clearance= 0.010", below deck
Rod length= 4.921"
Stroke= 2.677"
Crankcase deck height= 2.988"
Base gasket= 0.020"
Cylinder length= 4.520"
Assembly heigth= 7.518"
Cylinder deck heigth= 7.528"

With all that the squish calculated to around 0.030", my target is 0.045". So if I am right we will have to take .015 off the domes. This is all by numbers, it may be different when assembled.

 

[BROSS]

Do you know what size flat top domes you're going to use, also what type of head do you have?

28cc ADA head and domes with a blowsion girdle kit.

TJ assured me it will have awsome bottom end.

 

[BROSS]

I may have to get another set of domes if the compression is to low.

 

[#ZERO]

I'm curious as to where your port timing, duration, and blowdown time is going to be once it's all together.

With 29 cc domes you'll be around 170-175lbs. and with 27cc domes you'll be around 185-190lbs but if you have to machine the squish band the cc's will be considerably less.

 

[BROSS]

Well the cylinders are done and on the way, pistons are done being coated, pick them up today, pics to follow.

 

[BROSS]

The pistons turned out awsome.

The mock up for the battery box. Lots of room, its gonna be killer.

Its comming together now, the cylinder will be here in a couple of days. Need to paint the cases and cut the base gasket and I'll be putting it together.:bananalama:

 

[bad93blaster]

Usually superstock engines are a bit soft on the bottom end and hit extremely hard in the mid range with the top end more suited for racing.

This engine is going to hit real hard in the mid range, like someone turning the nitrous bottle on, if I'm correct.

Do you know what size flat top domes you're going to use, also what type of head do you have?

It's going to be harder to make the boost and transfer ports wider to match the NW sleeves with them installed.

i can tell from your post you never rode a judge s/s motor

 

[#ZERO]

Those pistons look sexy. :love:

Did you have Jet-Hot put the molybdenum disulfide on the skirts and ceramic coat the top?

How much did they charge to coat those pistons?

i can tell from your post you never rode a judge s/s motor

Are Riva s/s engines the same or does TJ do something different? :Thinkingof_:


Technically this won't be a TJ engine either; he's just doing the cylinder porting.

I'm curious to see how the cylinder porting going to turn out, please post some pictures when you get a chance.

 

[bad93blaster]

Are Riva s/s engines the same or does TJ do something different? :Thinkingof_:

there is a difference between riva and judge porting

 

[DAG]

wow, srly nice pistons (...as ghey as that might sound)


they did turn out nice

 

[tom21]

I find nothing ghey about eyehumping another mans engine internals. we are men after all. oggling him however IS gheeeeeeeey.

 

[BROSS]

The coating is $30 a piston, for the skirts and dome. HM-35 Ceramic coating on the dome, repels the heat back to the chamber where it is needed to make power. HM-30, a anti galling material used on the skirts. It allows you tighten up the piston to cylinder wall clearance without fear of sticking the piston, also keeps the piston straighter in the bore for better ring seal. The company is awsome, they do all sorts of coatings, for Nascar and so on, almost had my chamber powder coated...

 

[McDog]

What benefit do you get from the coating?

 

[BROSS]

Edit

 

[DAG]

ahh,, i knew the skirt coating help with the filling of imperfections making it tighter tolerance.. had not idea the dome coating repelled heat. Do they have a website? i'l like to read up on it.