Cool Chad. I remember us discussing the use of Variable Vane Tubos... 5-6 years ago. After reading through A.G. Bell's Forced Induction Performance Tuning, as recommended by you. The view back then was that they were not practical. Amazing how things change. It will be interesting to see how much the low RPM will be improved on a GT42R . Any info on this you can share?

 

Mike,

The variable vanes were not practicable because there wasn't a metal available that would take the heat generated by this application. Up until very recently, 900 degrees F was about the best temperature the available materials could handle in this vane application. Until very recently only smaller turbo's could be made for. The 997tt application was a breakthrough even though it is a somewhat small turbo.

New space age application metals are the reason for this type of turbo's advance.

As soon as I get permission I will share. This is like, although not on the same level of importance as the Techart GT II front end I got my hands on years ago. It was the first one outside of Techart Germany that was available period. I remember the US Techart rep in Southern California giving me a call wanting to know how I got one months before he could. The same type of situation is true with these turbo's.

 

That's very exciting Chad. These could be a real game changer.

 

Hope this does not get too boring. We are currently doing the bottom fit up prior to sending the parts to Swaintech for coating. S Car Go wants to run the bearing a tad on the loose side for this motor and the Swain coating for the bearings adds 2/10,000 thickness. Therefore we want to emery cloth the bearings 2/10,000 under prior to the applying the coatings.

In addition the pistons are being manufactured to compensate for the 8/10,000 coating for the skirts and the 3/1000 coating for the domes.

For those intersted in costs for coating the parts they are as follows:

pistons and skirts $52.50 each
rods bearings $35.00 a set
main bearings $41.50 a set
headers @ $250.00 a set
crank counter weights $250.00
rods $25.00 each
intake $250.00
turbo's $100.00 each
oil pump gears $65.00
intercoolers $100.00 each

 

Not boring at all, some cool info right there. I'm considering the coating for the intercoolers, so any more hard data on the results would be great.

 

According to Richard at Swain, the intercooler coating will increase the overall efficiency between 5 to 7 percent.

He also stated the best investment performance and longevity wise is to coat the piston domes and skirts along with the rod and main bearings. The rest according to him has diminishing returns.

 

I just received this e-mail from Neil ......... there appears to be another small delay.

Chad,

I am making a small change to the Liner making the top a lot stronger. As of this date we have had no failures, but further FEA work shows we can do better. We also want to coat the outside now with another special coating which should help even more with the contact with the coolant. The new updated changes only apply to the big bore Liners above 107.40mm.

These changes are immediate and the current batch of Liners will be used for NA applications only. I want the Turbo applications to have the newer design. I expect this to put back the delivery some 4 weeks. I will know more by early next week. I have asked for 1 set to be finished urgently for you so we do not hold you up any longer.

The ”rush” batch of 6 will need to be paid for in advance. As soon as I hear early next week, I will email you the new delivery date.

Neil

 

Hmmmmm ........ 82.4 mm stroke by 107.4 mm bore.

Did someone say 4.5 liters or more precisely 4.477 liters. Garrett GT42R's custom cams custom GT3 heads on the fly programable 0-150 shot wet nitrous and designed for 2.4 bar

The displacement is now a match for the flow of our heads. The heads tested out at 25 inches of water as follows :



( I guess our approximate cam lift spec has been disclosed)


Killer Angel ....... you're clear for launch, T minus 124 days

 

Nice!!

 

Has anyone had any experience with this shifter?

http://www.cartronic-motorsport.de/cartronic_sqs.php

 

Wait , wow I thought 9ff was pushing the envelope at 4.1 liters....4.5 liters and GT42R's....I know were talking 4 digits, but how much over?

I bet this engine will love nitrous

 

There are many combinations of stroke and bore to increase displacement.

The costs for adding displacement are not as much as you think. Where the costs pile up is modifying what is available or just making your own prototype. A 80.4 mm Arrow Precision crank is available for about 6K. 102.4 mm steel liners 4K, pistons 1.8K and rods 1.8K. That is a 10K add for 4.0 liters. Start pushing bore and stroke much past those numbers and costs skyrocket. Start improving on the basic components and costs also rise fast.

Another problem is changing parts. I have so many extra valves, cranks, rods, pistons, etc that I could build at least three motors. This happens either because I have either discovered something new or just didn't get it right the first time.

I guess what I am trying to say, if I knew what I know now, the costs would have been a lot less.

What makes this motor nitrous friendly is the slightly lower compression along with the ceramic coated pistons, valves, combustion chambers and exhaust ports.

 

Simon.

107.4 is about 2 mm more than what I was expecting. The 105.7 mm liners were requiring a good amount of machine work all by themselves. I can only imagine what 107.4 would require.

I have been out of state for the last week. I'll be talking to Neil sometime this week. At this point a couple more millimeters would be nice, but I don't want it at the cost of more delays. I want this car running by June 16th ........ this year.

 

Spoke with Rob @ S Car Go today. He said he would be sending me some pics tomorrow.

 

it's a day past "tomorrow" Chad