Mikes 3.5

[DYB]

Originally Posted by Henry Schmidt

Better exhaust and better cams are the key as well as the higher RPMs achieved by these smaller engines.
BTW: that's 265 hp 300 ft/lb of torque

Ahh...thanks for the answer and qualification on the torque. I was racking by brains how a piston and cam upgrade could get 300HP without induction and exhaust changes. All interesting stuff.

[CT944]

Great looking motor. Color combo is unique, which I like.

[rdimarco]

Did you use the slip-in or machine-in 100mm Nickies? Do you think the same piston/cam combo would work OK with CIS using the early heads and intakes on an SC with a 3.2 crank/rods?
Thanks and nice work.

[Henry Schmidt]

I believe the slip in 100s end up just a touch too thin so if you can (I.E.: the case is split) I would always recommend boring the case. We did.

The CIS injection tends to get lean on a constant / steady cruise and with a 3.5 this would be exacerbated. If CIS is the direction you go, watch out for lean cruise.
A reworked CIS will deliver enough fuel otherwise.

[JYRI ERAMAA]

[QUOTE=Henry Schmidt;5154285]I believe the slip in 100s end up just a touch too thin so if you can (I.E.: the case is split) I would always recommend boring the case. We did.

do you mean to make bigger stud spacing for the 100mm cylinders? (3.6 LITERS STUDSPACING?) or what might be the trick?

(i would guess that with these slip in 100mm cylinders you might have a weaker cylinder after all....)

IM INTERESTED because i also have 100mm cylinders and 3.0 engine to start.

Jyri / helsinki

[Henry Schmidt]

Although a larger stud spacing might allow for a stronger cylinder there is no need to go that far.
The issue is cylinder thickness at the base of the cylinder where it go into the case. Nickie 100s are manufactured in two different configurations.
The slip in cylinders are designed to fit the stock 3.0 and Carrera spigot. The better choice are the cylinders designed to fit a spigot that has been opened 2 mm.
This cylinder has a wall thickness 1 mm or .040" greater creating a much stronger cylinder.

[Henry Schmidt]

Final pictures of Mike's 3.5 rebuild.

[RichHawk]

Wow, That looks like everything I just got done doing except in Fast forward at 100 times... Oh and the engine is already installed in this thread. no so for mine.

I can't believe how much less cluttered the engine bay is with out the engine mounted blower motor.

Excellent job Henry!

Richard

[Daniel Cooper]

Henry-

it looks like you put the heads on built up with the cam towers, cams, and rockers all installed. Is this how you usually do it ? And if so why ?

Daniel

[MSRS2K]

Originally Posted by Henry Schmidt

Twin plugging is a luxury that should be considered way down the list as far as performance options are concerned.
Bang for the buck is almost silly. This a street cabriolet for heaven sake.

Henry, I'd like to hear more of your thoughts on this. If this 3.5 were twin plugged, compression upped to what, 10.5 (?), and appropriate timing changes, etc, what kind of HP would you expect (assuming 265 single plug)? What other benefits would you see from twin plugging?

And what would the cost be to go twin plug on this engine (ballpark)?

Thanks.
- Michael

[Henry Schmidt]

******Micael, welcome to the board******

Originally Posted by MSRS2K

Henry, I'd like to hear more of your thoughts on this. If this 3.5 were twin plugged, compression upped to what, 10.5 (?), and appropriate timing changes, etc, what kind of HP would you expect (assuming 265 single plug)? What other benefits would you see from twin plugging?

And what would the cost be to go twin plug on this engine (ballpark)?

Thanks.
- Michael

HP gain, who knows 3-5 % ??? $ 3,000 easy call.
I got this text the day Mike headed home.

"Asian kid in a late model 300 ZX trifled with me. Not sure if it was a turbo or not as he quickly disappeared in my rear view mirror".

This stuff is supposed to be fun. Mike sounds like he's having fun.

[rdimarco]

Sorry to drag up an old thread, but I am doing a very similar build. Are the heads chamfered? I can’t quite make it out in the picture. Most threads I found on the 98/100mm builds say to chamfer. If not, any benefit to the extra squish at the edge? JE & EBS said chamfering is not needed due to the wide flat at the edge of the piston.
Thanks again for sharing.
Rick

[Mighty2.0]

The oil return tubes look "extra glossy". Along w/ the other hardware, they look great!

Were they replated too?

[Henry Schmidt]

Originally Posted by Mighty2.0

The oil return tubes look "extra glossy". Along w/ the other hardware, they look great!

Were they replated too?

The oil return tubes are new and the hardware is a combination of new and replated.

[Porsche84]

Henry

How do you get the aluminum on the case and trans to look so good? Is the plating yellow cadmium? Beautiful engine (as is the 2.5 in a different thread)