1600 turbo build thread

[buguy]

Also a few weeks ago I threw my arms up and was just going to grab some slip ins and be done with it! But then figured I still have to get all the bearings, a cam, lifters, flywheel, clutch, pressure plate, pushrods, oil pump, rods, pistons and cylinders, crank or get my crank 8 doweled, and have my heads redone at minimum.
So really it's just a matter of more expensive heads, a little more on rods, little more on clutch, and mostly the same rest of the parts so I may as well go for it now.

[buguy]

Do you guys think if I went with a bigger valve head (42x37.5 as opposed to 40x35.5) it would move the power too far up in the Rev range for a street car?

[Chip Birks]

Guess I better take my AA's out and get some Mahles......

Gotta remember clone, you are limiting to 5500rpm or so. That is whats probably keeping the wrist pins still in place. That combined with your detonation management is whats keeping things together. An fk10 based motor is gonna rev. It might not make peak power at big rpm, but it will gladly go there with power to spare. Thats where those AA pistons will be in trouble.

[buguy]

I'm thinking about buying a CB black box or the magnaspark to control ignition until I can get MS on there. Or maybe there is a way to go crank trigger that I won't be wasting money on stuff that will end up on the shelf?

[andy198712]

MS kit can be a cheaper option then buying ready made, and run it just ignition.... i ran mine ignition only for a long time, add FI was just a matter of adding the FI hardware after that

[Chip Birks]

MS kit can be a cheaper option then buying ready made, and run it just ignition.... i ran mine ignition only for a long time, add FI was just a matter of adding the FI hardware after that

very true, I just bought an MS3 build it yourself kit for like 360 bucks on a 10% off sale a few weeks ago. They'll do another on black friday. Took me a couple hours to build it, but now its a pretty capable setup, and it didn't cost that much. You could get a fully assembled Microsquirt with harness for about the same price, just depends on how capable you want it to be once you start putting it to work. MS3 is pretty capable, most vw owners will be hard pressed to use it to its fullest.

[buguy]

Hummm. I could swing that. It's not much more than a magnaspark

[buguy]

Dang. I was checking out this CB build. http://cbperformance.net/images/BobsSpyderDynoChart.jpg

[Chip Birks]

I like that cb doesn't even use their 1.3 rockers.

[buguy]

I think every build except one that I have seen were all 1.25 rockers. I think there was one I saw that was 1.4.
I wish they posted boost numbers on those sheets. I don't quite understand how they made so much more power than the others with that build. Most I saw on their site were right around 300 hp and that is with 2276-2387cc and many are around the 7000 rpm mark or even a little more. That build peaks at 6500 rpm with a small stroke. Might be the highest flowing heads I've seen on their turbo engines though. At least the ones they post about.

[petew]

The chart doesn't note the manifold pressure (boost) figures. That might explain it. Also, different dynos give you different figures.

[buguy]

Sure. But I assume they dyno all of their engines in house so the spread would be the same either way. But it does say it was run on 91 octane with an intercooler. Seems like most of their engines are in the 8.5-9:1 compression so they couldn't have been running too much boost I wouldn't think. I don't think I've seen one they listed that ran more than 14psi.
But yeah. If they would list compression and boost that would help a lot.
Maybe I will call and talk to Mark again tomorrow and if he has access to those missing numbers.

[woodsbuggy1]

Wow, very impressive numbers. One of my friends has a very well built 2387cc NA motor that will climb anything and he had it on an engine dyno prior to purchase and it made 152hp and 156ft/lbs but i live in flatland Indiana I am sure it would have made well over 250hp on the west coast. I a a firm believer that a dyno is a great tool for tuning but I think that there can be major variations in dyno readings.
Kenric

[Clonebug]

Revving an engine above 5500 on the street is going to get old if that is where your power is.
Build it for streetable power in the 5000-5500 rpm range where it is usable.
My engine performs great shifting at 3000 rpm and going to 4000 rpm makes a big difference in acceleration..

Most of CB's hp ratings are crank hp and torque.
The above engine is intercooled while most of their engines don't seem to be. You gain a fair amount of hp with the cooler air.

[buguy]

No doubt. But I'm sure CB has it pretty well dialed in. There are lots of people staring at them.
But really it's not necessarily the numbers I'm curious about, just why it's so much higher than the others.