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Is your chryo process a full heat treat, chryo-quench, and temper? Or are you primarily only chryogenically freezing the parts?
Full thermal cycle... Taken down slowly, held at max temp for an hour or so, then brought back up to, and (well) above room temperature. All in all most parts live for about 36 hours in an environment other than room temperature.
I have a question; It seems to me that a lot of European engine builders don't go bigger than 102mm pistons, because they don't like thinner cylinder walls. Most of them use Mahle pistons and cylinders.
Your engine seems to be very bulletproof in every way... To get to a 4.1 engine with stock stroke, what pistons are you using? 106mm?
I am sure that you know what you are doing, I'm just trying to learn something
I have a question; It seems to me that a lot of European engine builders don't go bigger than 102mm pistons, because they don't like thinner cylinder walls. Most of them use Mahle pistons and cylinders.
Your engine seems to be very bulletproof in every way... To get to a 4.1 engine with stock stroke, what pistons are you using? 106mm?
I am sure that you know what you are doing, I'm just trying to learn something
Everyone builds different things, custom engines often take on the character of the designer, and builder.
That said, this engine uses proprietary LN Engineering Nickies cylinders. I assisted in the founding of LN in 1999 and have done 100% of their development personally. I still have the very first set of Nickies cylinders ever built in service on my 220HP, 2.6 liter 914 engine, stuffed in the back of my 356 Outlaw. After some 16 years, and service in 4 different engines, they are still perfect.
To a typical cast cylinder, asking them to stay straight over a long period of time just isn't something that is realistic. Fact is I have used up to 107mm Nickies even in forced induction applications with solid results.
The standard crankcase opening size of 109mm has been increased to fit these Nickies, which are built for this purpose, specifically. This helps to retain more wall thickness.
This thread is the first time I have ever pictured the things that it takes to make my engine work, and I will not be showing 100% of it, or explaining it. Things are different when the builder develops, and manufacturers his own components. Most all you see here are items that can't be easily bought off this shelf. Thats what makes this engine "built, not bought".
Keep in mind this car weighs 1800 pounds, the engine will push this car like nothing. If it were being build for a full weight 964, I would definitely alter the combo.
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The standard crankcase opening size of 109mm has been increased to fit these Nickies, which are built for this purpose, specifically. This helps to retain more wall thickness.
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Nice build!!, a little different from the norm for these days. A friend just had you build an engine for his Boxster, he is thrilled w/ the quality of the work. Was at LRP last Fri but the car sat idle, he's chomping at the bit to get the break in done.
Just a little nit to pick, stock 964/993 cylinder base is 107mm, the RSR 102s use 109mm w/ the larger gasket and machined slot in the block.
Yes, the OE 3.6 spigot is 107mm. Commonly used larger bore cylinders use the standard 109mm boring diameter, and as you mention, the 3.8/ 102mm is also 109mm.
I was stating that the register size for these cylinders is larger than the standard 109mm, allowing for slightly thicker cylinders. Glad your friend loves the Boxster that we repowered for him!
This thread is the first time I have ever pictured the things that it takes to make my engine work, and I will not be showing 100% of it, or explaining it.
To a typical cast cylinder, asking them to stay straight over a long period of time just isn't something that is realistic. Fact is I have used up to 107mm Nickies even in forced induction applications with solid results.
Keep in mind this car weighs 1800 pounds, the engine will push this car like nothing. If it were being build for a full weight 964, I would definitely alter the combo.
I had wanted to hear something about use of Nickies in forced induction engines, even when I talked to LN, they couldn't give me any references.
1800 pounds?! 816KG?!?!!? Could you also elaborate a little on that side?
10-11-2015, 03:51 PM
