250 WHP Supernatural 3.4 Build (Page 4/47)
BillS OCT 13, 11:04 AM
On my turbo Fiero, the limiter was set to simply cut fuel - there was no popping, the fire just went out if you exceeded a certain preset boost pressure or if there was knock. Very disconcerting if you aren't used to it - you wonder what you blew. Most spark limiting systems just eliminate every other spark to the plugs and the engine still runs but 'goes flat' without allowing any increase in engine speed.

I grew to appreciate the over-boost limiter - only happened occasionally on long straights using full boost.
La fiera OCT 14, 11:14 PM

Prep the bores for piston installation.
I used my own assembly lube. Its hi in MOs2 thus the grey color.


Pistons get coated with a MOs2 dry lubricant on the top and skirts
This dry lubricant is also a shield for hi temperature.


Rings gapped for my application and going in.
I opted for +.040 pistons to increase compression


The block was decked to purposely have the crowns of the pistons protrude out.
You can see how much the crown comes out. That is a flat bar on top of the piston
and the gap between piston crown and engine block is pretty wide.


Torque mains and rods to the specified torque and mark them as you go along!
The bearing clearances of the mains and rods have been checked already.
I opted to be on the looser side so I have to use 10w-40 and up oil.


Next is the cam and lifters. Besides lubing it up I apply a coat of dry MOs2 lubricant!
This is a mechanical cam and lifters set up with high pressure springs, so lubrication on start up
is very important!!



Now the lifters. Look closely at the first picture and you'll see a little pin hole on the face of the lifters. These lifters supply pressurized
oil to the cam lobes. Now you know why I opted for the HV oil pump?


Install timing chain. I chose the Double Roller for this motor.
In my 170WHP 2.8 I used a stock timing chain and with the 2100 racing miles I did
the stock chain stretched considerably!!!! So, I learned my lesson.
Make sure to apply plenty of assembly lube between the chain, sprockets and slider.

Next, the heads go on. And I will reveal with what compression ration I ended up with! Stay tuned!!

[This message has been edited by La fiera (edited 10-21-2017).]

pmbrunelle OCT 14, 11:32 PM
What's the idea of putting the MoS2 stuff in the cylinder bores? Won't that slow down the ring+bore break-in?

Obviously, the engine seems to have been a success, but I'm not sure if that step was a good one.

What kind of oil do you use? Does it have lots of ZDDP ? I suppose there are more ZDDP-filled choices in the 40-weight and up viscosities...

Is the camshaft black because it has been nitrided?

And how did you drill the lifters without leaving a burr?
La fiera OCT 15, 12:30 PM

quote
Originally posted by pmbrunelle:

What's the idea of putting the MoS2 stuff in the cylinder bores? Won't that slow down the ring+bore break-in?

Obviously, the engine seems to have been a success, but I'm not sure if that step was a good one.

What kind of oil do you use? Does it have lots of ZDDP ? I suppose there are more ZDDP-filled choices in the 40-weight and up viscosities...

Is the camshaft black because it has been nitrided?

And how did you drill the lifters without leaving a burr?



ZDDP is a very good extreme pressure lubricant but the more pressure exerted on ZDDP the more draggy and inefficient it becomes
because it requires energy to overcome the friction. In the other hand MoS2 and WS2 don't have that problem, the opposite happens.

I add MoS2 solid lubricant to the assembly lube to be safe when turning the engine for the 1st time.
I use Comp Cams mineral 30W Breaking Oil for the first start up and 30 mins of engine running.
I also drive the car with the breaking oil and do plenty of accel and decel at different RPMs to seal my rings.
The following oil change is a 10W-40 rich in MoS2 and good ZDDP, so MoS2 is the main anti-friction additive.
I've built many engines and the follow this procedure and have never had an oil comsumption problems due to rings not sealing.

The camshaft is coated with MoS2 dry film before the assembly lube is applied.

The lifters are made that way. Its called "Cool Face"
They have a .024 hole that is precision
machined in the face of the lifter. No
significant oil pressure loss, but significantly
improved cam and lifter longevity
La fiera OCT 21, 11:20 PM

Installing the pump.
The Camaro pump and screen where used because the screen pump hole and the screen pipe are bigger diameter.
The pump mounts without a gasket but I always use liquid gasket between the mating surfaces to create a tight seal.

Bottom end ready for the top end!
La fiera OCT 24, 10:04 PM

Lets put some heads up!


After torquing both heads the rockers are installed and lashed!


Intake and headers on and torqued.


If you want a REAL harmonic balancer, this is it. After shredding the stock one apart because it couldn't take the RPM I decided to to do some research and found this is the best of the best. Engine revs so fast, free and clean!! I'll never go back to stock!
La fiera OCT 24, 10:15 PM

I need some money to keep up with the project so lets work on some expensive cars!
I love this part of my profession. People buy Lambos and Ferraris and Porsches and I drive them for free!!!
2.5 OCT 25, 10:32 AM
Cool stuff.
I am a fan of Mos2 as well.
Whats your opinion on running an oil that comes with moly in it all the time, not just break in? Or Moly additives? New or old engines.
2.5 OCT 25, 10:41 AM

quote
Originally posted by La fiera:

The weight goal with the engine must be below 2200lbls
to have a competitive power to weight ratio.
:



Do you have a list of car lightening mods?
La fiera OCT 25, 01:27 PM

quote
Originally posted by 2.5:

Cool stuff.
I am a fan of Mos2 as well.
Whats your opinion on running an oil that comes with moly in it all the time, not just break in? Or Moly additives? New or old engines.





This is the oil I use in all my cars. I have used it for years and never had a problem. It is a REAL antifriction oil.
It has 1200ppm of Phosphorous, 1100ppm of zinc and 1300ppm of Mos2 if I remember right.
Its the perfect match for the flat tapped equipped engine
You can get it in at Advance Autoparts now since they bought WorldPac.

[This message has been edited by La fiera (edited 10-25-2017).]