How big can you bore out the stock TC 88 jugs? Are there any risks in boring out the stock jugs? Can one go too far? What are the dangers if any?

I am considering porting and polishing the heads instead of buying the SE heards my dealer is really pushing for. I am also considering boring out the pistons but am unsure of how large I can go safely? Then last...the cam, i am not sure how radical i can go on the cam? I am not looking to be able to go to 120MPH but want to get to 100MPH as fast as possible.

 

The largest safe overbore on stock TC 88 cylinders is 95 cubic inches. Do a search or check the tech article section of the forum; it contains a wealth of data on engine upgrades and modifications. You can pick up some info on the link below. You will notice that there as many different opinions on what make the best 95 cu in build as there are members posting replies.

https://www.hdforums.com/m_880429/tm.htm

Zyklon

 

Boring the cylinder to 3.875( 95 ) is the limit, now you can swap the cylinders for a set of after market cylinders and go directly to 98 inch and the cylinder is light years beyond the SE cylinder ( or stock)

 

HDWRENCH, now you pose a new issue: What do you gain (besides the obvious 3 cubes) by going to a set of aftermarket 98in jugs, vs. boring out the 88's to a 95 inch? I here the 98 aftermarkets have a coating called Nikasil or something? Could you expand my knowleadge on this? Thanks for any and all info (didn't mean to hijack thread).

 

We see a very nice tq gain in the lower rpm as well the Nikasil will run cooler we see in the area of 20* less oil temps, which on air cooled engine is a huge plus. With the latest version of the cnc head we see 100-104 hp and tq in the 110-115 range with a andrews 37 at 9.8.1 compression ( power pack I) . The over all kit is easy to install, you gain 3 extra cubes and increase in tq.

 

Thanks for the info and explanation WRENCH!

 

What about a 07 -96" motor? Would you still reccomend swapping out cylinders or uprgading to 103, 107?

I see alot of performnce packages for 88 to 95 but not many directed at new 96" motor.

 

We just did a 96 with just head work and a small cam 204 SE and made 90 hp and 105 for what the build is made of those are very good numbers.

 

HDWRENCH - I have read a recent issue on another site where some builders are finding the new 96" motors with pistons down the hole anywhere from .020" to .030". When combined with a stock head gasket, this was leaving a quench distance in excess of .070". This seems like an area for major improvement. Did you find thiis on the 96" you worked on?

 

I heard the exact same news today.

To compensate pistons will be made with a higer dome to make up for the difference?

I will be doing my 96" motor in a couple of months , cant wait to see
if my motor has short crank or what?