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NMRA pure street engine combination

16K views 99 replies 36 participants last post by  Ed Curtis  
#1 · (Edited)
How are these guys going 10.70's @ 124mph with the limited rules, especially the .500 lift limit on the hyd. roller camshaft and the intake manifold limitations. I do not see any specs in the rules for compression ratio but they do limit the combustion chamber to 58cc minimum. There is also nothing about what type of fuel can be used. I'm guessing that these guys are running a ton of compression with a very trick .500 lift cam and race gas. Anyone have any ideas. I'm not a competitor in this class. But they run close to the times I'm running with a much less radical engine combination. I'm just curious as to how they are doing it. See the rule book below.

NMRA Pure Street rule book
 
#3 ·
My friend runs this class...The cars are probably significantly lighter then yours as well. Trick cams, a little of this and little of that...Its tough, but they are going faster & faster every year...
 
#4 ·
They do run spec fuel...100 octane unleaded. The custom .500" lift cams and special built shortblocks help make alot of the power.
 
#6 ·
Jared Rude said:
It's mostly the cam and rotating assembly. The faster cars are probably turning 8500+ RPM to make the power.

8500???

Truth be told, not quite that high...

If you REALLY want to run fast in Pure Street... Email me, get the checkbook ready and be prepared to spend some big bucks... After all, Coiled just won back to back races using my stuff... :D

Ed
 
#8 ·
Jared Rude said:
Ed, I was really only speaking of one car in particular, and yes, 8500+. Granted it's a FFW car, but from what I understand, the rules are pretty similar now.

Titanium valves and higher compression are two pretty major differences and play a major role in the rpm potential! Besides, Tech at FFW is a bit more lax than NMRA on valvetrain (eg. lifters)

Ed
 
#9 ·
Nah....I'm not looking to go fast in this class. I'll keep my checkbook in my pocket thank you. I'll keep ya in mind ED if I hit the lottery or something! I was just curious as to how these cars go so fast with that rulebook. Obviously many many tricks involved. I think I'll stick with open comp and bracket racing.
 
#10 ·
I like the concept of NMRA Pure Street. I might be interested even more of they would do away with a couple of rules that I think are BS. Like the one where they penalize carbed cars 150 pounds. WTF is up with that? Anyone knows carbs are archaic compared to a properly tuned EFI yet they penalize CARBED cars? Also, they limit to basically only a few Ford production heads. The class should be open to any Ford smallblock head that was massed produced on any type of Ford car or truck.
 
#12 · (Edited)
twinturbosaleen said:

and let me guess race.. you want to run cleavlands lol
Clevelands couldn't be allowed because they are well over the 310 ci limit.

But, now that you mentioned it, wonder why they don't allow those old heads yet have a whole list of inline aftermarket heads that are allowed?

After all, those old heads are mass produced production Ford heads......

hmmmmm....
 
#14 ·
If they want to call that class Pure Street, then anything that came as a factory setup or part (heads) should be allowed and there should be no penalties for carbs if the car came with one from the factory.
 
#16 ·
All Cleveland said:
If they want to call that class Pure Street, then anything that came as a factory setup or part (heads) should be allowed and there should be no penalties for carbs if the car came with one from the factory.

Oh for for the love of stupidity...

It's only a F'ing name, not a credo!

Get a rule book and then build a car.

Then and only then will your opinions mean anything at all!

Otherwise, just STFU....

Ed
 
#18 ·
Taking a chill pill sometimes helps. Opinions are expressed here regularly. You don't have to slaughter the guy for one.

Kill the thread...
 
#20 · (Edited)
Ed Curtis said:

Oh for for the love of stupidity...

It's only a F'ing name, not a credo!

Get a rule book and then build a car.

Then and only then will your opinions mean anything at all!

Otherwise, just STFU....

Ed
Ed you sure do have a shltty attitude for someone who is in business trying to sell a product to the public. I don't give a damn if everything you built had a 4 cyl and was as fast as a t/f dragster I would NEVER buy anything from someone like you. I've never been involved in "class" racing like that and even I could pick a name that fit the rules better than that. Any car that I build will be built by MY rules not some dumba$$ rules such as these. I race for money and when I go to the track and run people on a one-on-one basis betting on the side, I'll certainly go home with more money in my pocket than 99.9% of the people that race in classes such as this one (only so many people can even place much less win).

Please continue to post statements like these as they only show your true ignorance (I'd never talk to a potential customer like that in my shop).

BTW opinions are like a55holes, everybody's got one and most everybody elses stinks.
 
#22 ·
Ed is right

First off who the heck cares about the old junk that is laying around. The heads in the list are much better than any old clevelnd casting.
Nobody runs that stuff anymore. It's 30 year old technology.

Names of classes............
Factory Stock
Pure Street
Real Street
Hot Street
Super Street Outlaw

THis was argument was a dead horse a long time ago. Go to a NMRA or FFW race, they are purpose built cars that meet THE RULES. Not a name of a class.



Robin
 
#23 ·
Robin, I certainly hope your last post was directed at Raceallday or BigDaddy since I have never mentioned cleveland heads in this thread but just in case you didn't know there are alot of people still running cleveland heads and flying with them for alot less than any aftermarket head.
 
#24 ·
Re: Ed is right

RobinLawrence said:
First off who the heck cares about the old junk that is laying around. The heads in the list are much better than any old clevelnd casting.
Robin
Then there is no reason that the old heads shouldn't be allowed if there isn't any advantage to using them..right?

Especially since they are mass produced heads from Ford.
 
#25 ·
There are still reasons not to allow them. Complexity or rules, and tech, illegal valve sizing, legal intakes, non-windsor style exhaust patterns, etc...

I really don't care if they are legal or not but there are reasons, that's all I'm saying.
 
#26 ·
I don't think everything those guys are doing is all in the engine. Their cars are very efficient and the top guys are VERY good drivers. There probably are some "secrets" out there but not anything anyone else couldn't figure out due to the limitations by the rules.

Take a look at what they are doing in F/S with those rules!!! Sure, the short blocks have trick pistons, rods and cranks but they are running high 11's/low 12's with stock ports and intakes.

I have two motors built for F/S and made good power out of both combos. One of the motors I believe would put the car near the top of the class as far as power is concerned but it certainly does not mean it would ET with those guys. It is like Robin says, "you always see horsepower numbers, not times, in sigs because some people simply can't drive"...or something along those lines.

I learned a long time ago that in racing you can put all of the best parts into the car and it doesn't mean a thing. A well thought out combination with an efficient chassic and good driver will win every time.