Box Stock

Predator verses world formula

G

Gene Atkins

New member
hello people,
First off I'm 70 years old and not ready to give up yet. I know about animals, world formula engines. However I'm not up on clones or predators. My question concerns predator motor which I purchased already it is not a hemi head. What would it take to run with a world formula which has animal pvl all other items stock except head milled and running on methanol. Is it possiable to run with it? It's my brothers and he is a little younger lol. Or should I just buy another world formula.
If it would what would be you recommendations.
Thanks
 
Yes its possible. You would need at the very least to bore the block for a 2.81 or bigger, billet rod, flywheel, you'll need a very well done head that has been ported and polished with at least 28.5 intake valve, somewhere around 350-400 lift or more and some valve springs that can handle it, more compression, and probably most importantly a carb that can deliver enough fuel to run it, like a Tilly or custom gx390. Alky would be the fuel of choice. You might be able to get away with less, it really depends on how well the WF is built and how well the drivers setup and tire game is also. I would try a stock bore and stock stroke predator with just a big cam, springs, and good head work with a good carb on it first and see how that does
 
I doubt you really want to cross your fingers and hope that radical surgery on the clone will make it run w/the engines you are competing against.

I found out.....decades ago......do NOT try to re-invent the wheel. Get yourself a known good quantity...in this case a WF...run it right out of the box.

IF you need more engine then....take it to a Briggs OHV specialist, and have them make a few changes.
Shouldn't have to spend much to give it a nice step up.
After that.......you go with what your desires/necessity for speed, and budget.

You can get significant improvement with a very reasonable investment.

Going ALL OUT.....like for Unlimited racing, is a horse of a different color.
THAT horse has a lot more of the color green involved.
Enjoy!! ...........PD
 
i got a predator that isn't scared of the briggs stuff! It's the tires that determines how fast you can get around the track. But I will say the blocks seem to be the weak link!
 
A predator can be built to run with the WF and Animals for 1/3 of the cost...and thats including having the block welded and braced as part of the cost, for best reliability. Anyone that tells you a predator or clone can't be built to compete with the Briggs engines for less money cost wise has obviously not been able to do it before themselves.

I just noticed you said the WF are basically stock except a milled head....you really would not need to put alot of money into your predator to make it competitive with the WF's, that would be pretty easy actually. You could spend less than $500 and have a predator that would leave the WF's behind if your kart setup and tire game is on par with the rest of the competition
 
Gene Atkins said:
What would it take to run with a world formula which has animal pvl all other items stock except head milled and running on methanol.
Click to expand...
The WF with the Animal coil will spin on up in RPM's. Milled head will not result in a noticeable HP increase, BUT if it's jetted right to run on methanol that is a pretty good HP boost. With the Animal coil & running methanol this engine will be a good bit faster than a "stock" WF engine. Are they running the "stock" WF exhaust or running a different header/muffler? That will make a difference too.

The predator will need a big carb, big cam, billet rod, and ported head at a minimum. W5R laid it out pretty well above. Just remember, you can pick up a good used WF engine for $500-$700. See them here and on other forums for sale. So, it's up to you. Sure, you can build your engine to run with or outrun the other. But what would be a better race??
 
W5R said:
A predator can be built to run with the WF and Animals for 1/3 of the cost...and thats including having the block welded and braced as part of the cost, for best reliability. Anyone that tells you a predator or clone can't be built to compete with the Briggs engines for less money cost wise has obviously not been able to do it before themselves.

I just noticed you said the WF are basically stock except a milled head....you really would not need to put alot of money into your predator to make it competitive with the WF's, that would be pretty easy actually. You could spend less than $500 and have a predator that would leave the WF's behind if your kart setup and tire game is on par with the rest of the competition
Click to expand...

I agree, but unfortunately I have yet to see a highly modified clone stay together very long on our track which is a large 19 turn asphalt sprint track. That said, I'm building a hemi, was able to source a 26mm WF carb and a bunch of the externals I needed used and cheap, and have about $500 into the "longblock" so we'll see what happens.
 
A predator would easily out power and out run a stockor slightly modified briggs WF. And it can do it for less money. It's cheap and easy to get 20hp.
 
Having competed against, seen dyno runs, and ran both engines, I think the WF has more torque across a broad RPM range. I really prefer the clone head design better and they flow better but at the same time the power delivery is all moved up. Keep in mind this is on gas and I'm not going to condone modding the WF much past stock form.
If one is planning to go with a hotter build on alky, then I have to say it's time to build a predator. The WF is designed to be a heavy class spec motor so by converting it to alky and removing the 7100 rpm coil he's defeated the purpose and pushed it into it's iffy zone as far as reliability not to mention will have over $1k in it if bought new. Take the predator you have already, and build it to what your wallet will allow. Give us more info as the type of racing you are doing(dirt oval or asphalt turns and twisties?) and a budget and we'll all help spend your $$$ I'm sure:)
 
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