TheSamba.com :: View topic

Fri Jan 17, 2014 4:54 pm

they should prolly put it in the stickies or forum rules

read the op's post LOL!!

Fri Jan 17, 2014 5:06 pm

the rules of my class are

MUST be air cooled

and

CAN NOT exceed 1,600CC

so I can build the biggest, most bad ass 1600cc motor I can, I will be starting with a whole new motor, the 1200 is long gone haha

when I wound that motor out I was hauling some serious tail, so a 1600 will be amazing.

from what I see, I can pick up a junkyard motor, and just go through it new bearings and what not. nice light weight pistons/rods, balanced everything, etc etc.

I saw something about using a small CC motors heads for higher compression ratio??

Fri Jan 17, 2014 5:54 pm

Do you need the motor to rev high for your racing or was that you just trying to get power out of the 1200? A stock 1600dp will make good power but not want to rev (how the hell were you getting the 1200 to rev like that?!?). In your original post you mentioned you were getting a replacement transaxle, I guess there's options there to help lower your rpm if needed.

Seeing as this is a race only motor, it really opens up some good/cheap hp options. Port speed? Pffft! Hogged out ports will do. Unless you do need some low rpm power at times.

What fuel are you limited to? That makes a big difference.

Fri Jan 17, 2014 6:23 pm

Here's some estimates for a couple combos from dub dyno:

Both have reasonably high compression assuming good fuel is an option.

In the background is a 1600dp. The first motor is milder and uses a centremount carb which I prefer offroad. The second uses twins.

Fri Jan 17, 2014 6:33 pm

maybe try this

69mm C/w
85.5 pistons
lightweight rods
CB lightweight lifters
VWAircooled.net dual taper aluminum pushrods
40x35 heads with dual springs, I don't think bigger valves will help with 85.5 pistons
FK-8
extractor exhaust
dual 40 IDF carbs(use 30 or 32 vents for high rpm power)
lightened flywheel(faster revs)

that should see good power in the 4-6,000rpm range

but if you get a smaller gear ratio to lower engine rpms, consider ported heads, and a smaller cam(to move power band where you need it)

this would be similiar to the bottom of above post

Fri Jan 17, 2014 6:57 pm

Well, I am limited to C16 race gas.

I will have to run a chain to go from the transaxle to the wheels. I am trying to find a picture of my old buggy, but I can't find it...haha

so with a C16 limit, I can run the biggest carb I want too! haha

Fri Jan 17, 2014 7:31 pm

This is the best picture I have of the buggy, it sat roughly 5'5" off of the ground, And no, the black buggy isn't in the same race haha it's from a poster about the races a few years back

Fri Jan 17, 2014 8:14 pm

SWAMP BUGGIES!!!!!!!!!

Dale

Fri Jan 17, 2014 8:48 pm

how about a turbo? any reason why you cant in your class?

Fri Jan 17, 2014 9:41 pm

No forced induction, at all has to be 100% all motor, nothing added for power, except for a ton of race gas and what not. I can run a 1100CFM carb if the motor will take it haha

Sat Jan 18, 2014 12:24 am

I looked into the VWaircooled.net thing, I can't find a page, It sends me here on google

http://vwparts.aircooled.net/default.asp

Sat Jan 18, 2014 2:07 am

It works fine from here. I think the server may have had a hick up and has been temporarily down.

T

Sat Jan 18, 2014 2:20 am

That's strange...I put it into my browser (firefox)

and it takes me to sandigoclassicandmusclecars.com and gives me a 404

Sat Jan 18, 2014 3:08 am

I think you'll be heading along the lines of 75smith's suggestions, especially if you can run a lower ratio to use the revs. A de-stroked big bore engine would allow more HP, but diff ratios that high are hard to come by these days and tend to be a bit more prone to breakage. I don't think smaller tyres would be appropriate on such a vehicle. We've run something along 75smith's lines in mud bash cars with stock gearboxes, but that lack of low end made it tricky to drive.

Sat Jan 18, 2014 3:11 am

all my gearing will be made up in chain drive, I will most likely be using a stock transaxle and highly modified engine, unless I need to have a stronger transaxle, the stock box on the 1200 held just fine haha except I randomly lost 3rd gear, then just as mysteriously got it back a few runs later...

Sat Jan 18, 2014 4:12 am

Try and clean your browser´s temporary files and restart Firefox.

I would get some high roof CP pistons and take advantage of the C16 fuel. With that 160 hp is easily obtainable with basicly off the shelf parts. (Apart from the pistons.)

T

Sat Jan 18, 2014 5:10 am

Is there a site, that I can get into (haha) where I can get everything from? or is it all from across the internet?

Sat Jan 18, 2014 5:54 am

You are not going to build a 160 HP 1600 by simply buying off the shelf parts from one place. You will need to do a lot of custom work from several talented people that specialize in power.

Again I'm gonna say if you want to win races you are going to have to spend big money on heads from a custom head porter.

Sat Jan 18, 2014 5:56 am

I rounded up the numbers across 2 sites, Aircooled.net, and kustom1warehouse.net.

I found the heads on aircooled.net, but they are for 90/92.5mm bore, I only have a 85.5mm bore, or am I wrong on that thinking??

but aside that, current total is roughly $3400 of the 5000 budget, so I can get a great ignition system, good clutch/flywheel, etc etc

Sat Jan 18, 2014 6:00 am

I don't -need- 160hp, I just need as much power as I can get from the motor, if a basically stock 1200 can keep up with the motorcycle powered buggies, then a built 1600 will destroy them