New project done

[Henry Schmidt]

Once in a while I build a car for myself. This little 70 "T" is one of those cars.

The engine is a 2.45 twin plug with 9.5:1 compression, 36mm ports, Mod"S" cams and 40mm Webers.
The trans is an A,F,M,S,X. The chassis is pretty stock except for Bilstien sport shock and a 911 SC front suspension.

[Henry Schmidt]

[jsveb]

VERY VERY nice!

Like the background in the third photo as well.

Good to see you enjoy what you do.

[911 tweaks]

my oh my Henry...what have you done since I last visited you...?? I see that the peacock's still like hangin' out at your place...I see that you may of finally retired the toyota p/up or needed a larger p/up these days...??
I see many, many MANY subtleties in these pics showing your ALWAYS 110% attention to the details...I am surprised that you used a mag case for the engine...maybe because it is #'s matching to the car...??
Plenty of head lite power...it will be hard to outrun that set up at speed at nite... :-)
Grippy fabric seats w/ side bolsters...NICE...no radio as the engine will make PERFECT music...
Dual front oil coolors by the looks of the valve in the front rt side compartment...
I am WAY partial to this cars color...VERY NICE Henry...
Please reply with how the engine runs...I guess the specs on set up & performance are as stated in your 1st pic...Any other details on suspension and engine specs would be a bonus for us not so well versed in this advanced state of car prep...those heads look a bit special...casting date of 76...are they turbo heads you twin plugged...??
What a H^ll of a car...man oh man.............................
Thx for sharing...Bob

[Flieger]

Peacocks -- whoa, cool.

[ARCSinAK]

Wish I had that 2.45 for my 70T barnfind

[parts4porsche]

Henry, could you tell us what size of P&C you used and what brand?

I'm to build some thing like it. I have a aluminum 2.0 case, 70,4 crank and 85.5mm pistons 10,5 to 1 by wiseco. but unfortunately with cast iron cylinders, not biral nor nikasil.

I also have a set of 5 biral bored to 86mm(missing one), but I read that it's not safe to use biral bored more than 85mm, is it sounds correct to you?

my cams are Carrera S original, I'm thinking to cut the MFI pump drive tip.

noted that you did not use the hydraulic chain tensioner, some special reason? I have both, but not decided yet.

Carburator weber 40 or FI with ITB, also not decided yet

thanks
Tadashi

[lindy 911]

Who's the old fart cleaning the window?

[Henry Schmidt]

I'll try to answer as many questions as I can.

First: I would never trade a Tundra for a Chevy.....pleeeeease
The mag case was used because of matching numbers.
The engine has 70.4 mm (2.4/2.7) crank and 66mm cylinders.
The cylinders are AA 86mm Birals that we Cryo treat for thermal stability.
The pistons are JE 9.5:1 that allows us to run massive ignition timing (for a twin plug) with the horrible fuel available at the pump.
The engine produced 180+ rwhp @ 6400 with a red line of 7400.
We limited the dyno run to go easy on the fresh engine.
This little gem really pulls.
To stop it we used SC brake on the front with Cryo treated, cross drilled rotors front and rear with cryo treated Porterfield S4 pads front and rear.
Sport Bilsteins front and rear.

[Henry Schmidt]

Originally Posted by lindy 911

Who's the old fart cleaning the window?

That's Ken Emory but considering we're a barn full of "old farts" that description could fit all of us.

[Henry Schmidt]

Originally Posted by ARCSinAK

Wish I had that 2.45 for my 70T barnfind

We can build one for you "no matter how much it costs"...

[rsrguy]

This is pretty much the motor you quoted me on this last week. What is an AA cylinder?
How do they compare to using an OEM cyl?
The cryo stabilizes them, is any other machining needed?
How well do they hold up, long term?
What benefits will I see with MFI over carbs?
Is the twin plug manditory?
Why not go 2.7, or 2.8?

[tocobill]

Great looking car and motor Henry!!

[Henry Schmidt]

Originally Posted by rsrguy

This is pretty much the motor you quoted me on this last week. What is an AA cylinder?
How do they compare to using an OEM cyl?
The cryo stabilizes them, is any other machining needed?
How well do they hold up, long term?
What benefits will I see with MFI over carbs?
Is the twin plug manditory?
Why not go 2.7, or 2.8?

Wow, there a litany of inquiries.
Let's see:
AA cylinders are the only new Biral barrels available and are made in China. AA has been manufacturing 1720 kits for 356/912 engine for 20 years and they have a reputation of manufacturing a quality product.
We cryo them because we found that they had a slightly lower Rockwell number than a used Mahle.
We use them because they slip into a 2.0-2.4 case without machine work making them the largest (86mm) reasonably priced cylinder that slips into an early case.
The Biral barrel doesn't require piston squirters where Nikasil barrels do.
They seem to be hold up well. I have no reason to believe that they won't last.
MFI tends to offer better throttle response.
Boring the case to fit 90mm or 92mm cylinders creates a very poor base for the cylinder to seat on. Cylinder stability is one key to keeping mag case motors alive.
Twin plug is never mandatory if your willing to compromise on ignition timing or pay huge money for high octane fuel. I build these little engines with twin plugs because I don't trust the future of fuel quality (especially in California) and because "I can !"

[Henry Schmidt]

Originally Posted by tocobill

Great looking car and motor Henry!!

Thank you

[rsrguy]

Thank you Henry, that helps more than you know. If I were to use a reconditioned 2.2s set, your saying it would be advantagous to install the squirters?

[Flieger]

I am curious why you say that Biral cylinders do not require piston oil squirters, while Nickasil do. Reading books about the 917 reported a power increase after the switch from Biral to Nickasil due to the reduced friction. I would think the Nickasils would less need the piston oil squirters than the Birals. But still, those squirters cool the pistons so how would cylinders have such an effect on whether they are needed? Furthermore, aluminum conducts heat better than iron and without the contact resistance between the iron liner and aluminum fins as seen in the Biral, the Nickasil should run cooler.

[Henry Schmidt]

Originally Posted by rsrguy

Thank you Henry, that helps more than you know. If I were to use a reconditioned 2.2s set, your saying it would be advantagous to install the squirters?

No, the reconditioned 2.2 set is probably Biral. Biral is a cast iron liner in an aluminum fin casting. No need for squirters although squirters wouldn't hurt.
The issue with the reconditioned 2.2 "S" set is that it's used (with used tolerances), it make too much compression (10.3:1 +) and it will generally cost more than the new AA cylinders with JE pistons.

[Henry Schmidt]

Originally Posted by Flieger

I am curious why you say that Biral cylinders do not require piston oil squirters, while Nickasil do. Reading books about the 917 reported a power increase after the switch from Biral to Nickasil due to the reduced friction. I would think the Nickasils would less need the piston oil squirters than the Birals. But still, those squirters cool the pistons so how would cylinders have such an effect on whether they are needed? Furthermore, aluminum conducts heat better than iron and without the contact resistance between the iron liner and aluminum fins as seen in the Biral, the Nickasil should run cooler.

Cast iron is more porous than Nikasil hence they hold residual oil better.
As I stated above squirters don't hurt but aren't necessary.
The addition cooling of the piston is necessary for higher horsepower so my little engine has squirters.

[Flieger]

I always thought that the primary purpose of the piston squirters was cooling the piston once they got to 2.2S power levels in 1971. I never thought that the cylinder walls were lacking for oil. I guess they get splash-lubricated after the oil jet hits the piston?