I had a question about this. If I drilled out the dowel pins, how should I do this? Should I make it so the pins slide freely in and out of the motor, or should I drill them out so that the dowels become a transition fit - basically I would have to hammer them into the motor. Thus making it almost one piece.

How do some of the other 'kits' work with this? Are they a transition fit?

 

Im no expert in this, but i am an engineer..

I would say, use a reamer of the correct size and you are done.
Making it a tight fit and using a hammer could cause problems due to different thermal expansion, it also makes (dis)assembly more difficult

 

Okay. I do have access to lots of different sized reamers. I was just thinking that maybe if I made it a transition fit that it would increase the strength of everything.

I didn't think about different thermal expansion though.

 

don't do it! its just a band aid for a crappy tune/ecu...

notice that the PFC/motec people (the japanese) can run 700hp on stock everything just fine, but the haltech people struggle to get to 400hp before the engine breaks catastrophically?

 

Funny, the worlds fastest rotor runs a haltech.

 

No I haven't noticed that, but I don't see anything wrong with beefing up the motor. Lots of people buy better head studs - I kind of see this as a similar modification.

 

A stud kit or dowelling is a good idea if your going for alot of hp. No real point if your going to be at around 400hp or so. But everyone has their own opinions on the matter. His ecu argument is a load of ****, it's about the tune not what ecu is used.

 

If you are going to dowel pin the engine, mimic the same clearance as the OEM dowels in the engine. They are not a " snug " fit which requires a hammer. If you do that the engine will wipe out the engine bearings, then the rest of the motor comes next.

Unless you can machine the motor properly, don't do it. Our stud kit would be a much better alternative for you. I have a customer make over 900rwhp with just our stud kit, no extra dowels.

 

goopy oversize bolt kit is for the home guy, the rest requires a shop to get it right
if you select the s5 engine plates then the dowelling is not really necessary this side of 400 rwhp

spend the money instead on time to set up the ecu correctly

 

this!

 

The expansion coefficient of Aluminum is roughly twice that of steel, meaning that your clearance between the the pins and the housings will actually grow as the motor heats up. I agree that you should just use the same clearance as the stock pins.

 

I guess I need to get my terms right.

I'm asking about using thicker pins and enlarging the holes for that.


Yes, this is more just a theory than actual work that I'll be doing. I was just wondering.