460 Ford Forum banner

1 - 20 of 33 Posts

·
Registered
Joined
·
155 Posts
Discussion Starter #1
I have read many responses here, the people I have great respect for, correct the poster stating “That is a race motor son! not a street motor”
It always makes me think about the line between the two.
If we can buy an all alum, dry sump, titanium rod, supercharged, inter-cooled, 600+hp car off the dealer lot (street motor?) and we routinely build all iron, two barrel, hydraulic cammed, push rod engines for a hobby stock race car (race motor?) What makes one or the other?
So in your opinions:
What is the difference between a “street” and a “race” engine?
In my mind it was always the fuel. If it ran on race gas (something not available at regular gas stations) it was a race motor. Conversely, if I could get a Nitro Hemi to run on pump gas, it was a street motor. Admittedly, not a practical one, but a street motor none the less.

Just looking to hear opinions

As always, Thank you so much for the information and advice.

Jason
 

·
Registered
Joined
·
5,676 Posts
IMO, it's all in what you can afford$$$$$ to run on the street.....and the fact that you can get it IM'd or at least registered. Look at the "Pro Street" cars out of the 80's, I think they proved the fact that "street" doesn't have to be practical. It's all what your ego can afford. ;)
Rob
 

·
Registered
Joined
·
448 Posts
Street motor= an engine you can start up Monday morning at 32 degrees
with 4 inches of snow on the ground. Warm up for 5 minutes while you scrape
the windows and drive away without any stumbling, stalling, and drive 25 miles
to work 5 days a week. :D
 

·
Registered
Joined
·
860 Posts
Street motors have concessions made for things like driveability, idle quality, being able to live on pump gas, and long-term reliability with a minimum of maintenance. Race motors shift to the other end of the spectrum, purpose-built for maximum power regardless of the day-to-day driveability and an expectation that getting them to live for any length of time will take a more significant amount of regular fiddling, adjustments, and maintenance.

Is there a line in the sand delineating them? No. It has mostly to do with the intent of the build and how the final product works in a given setup.

Brad
 

·
Premium Member
Joined
·
922 Posts
IMO the difference is based on camshaft i.e. RPM range of the engine. Street rollers are smaller that a full effort race roller.

A car that has little or no bottom end and is setup to launch at 4500 rpms makes street driving a challenge to say the least. Stoplight to stoplight.

I also think it is some what based on maint. interval. A street engine is designed to have a longer time between majors. I see a Max effort race engine as needing, depending on build, monthly or weekly inspection of parts to make sure it is not eating itself.

My current build is a "street" build based on this concept. I used a street roller about 650 lift and tight lash exactly for this purpose. Even though this build will mostly be a bracket car. I want to try to run this build a full season without a complete teardown.

I enjoy working on the car but I hope to take it to the track make the needed passed without opening the hood. I know this is possible becauce I see Micro do it every weekend.

My opinion only.

Clay
 

·
Registered
Joined
·
5,483 Posts
My minimum definition is: Using a readily available fuel (pump gas or E85), the ability to be driven for extended periods on the interstate (4+hours), and "average" maintanence (change the oil, adjust the lash, etc).

If you can't drive your car to a track that's two hours away, race it all day and drive it home, it's not a street car.
 

·
Registered
Joined
·
232 Posts
My minimum definition is: Using a readily available fuel (pump gas or E85), the ability to be driven for extended periods on the interstate (4+hours), and "average" maintanence (change the oil, adjust the lash, etc).

If you can't drive your car to a track that's two hours away, race it all day and drive it home, it's not a street car.
Also it must be able to idle at less that 1500 RPM (less than 1000 RPM would be better) for extended periods of time.
 

·
Registered
Joined
·
1,560 Posts
Street engine = one I build

Race engine = one I have a race engine shop build

Broken engine = see 'Street engine'
 

·
Registered
Joined
·
412 Posts
definition

Still comes down to [MONEY MONEY MONEY] if u can build a1200 hp motor that has street manners but can go to the track and lay down impressive #`s then what is it ?? Guess its whatever u want it to be,cause u know it won`t be the same to someone else. S---t man i`ll just be happy to get my 528 fairmont build done [then again is it a streetcar or a RACECAR Bill
 

·
Registered
Joined
·
618 Posts
My definition of a street engine:
-Must run on standard pump gas
-Must be able to idle without someone in the car
-Must be able to run in below zero temps, and at temps above 100
-Must be able to be driven without burning off tires with normal throttle (aka no burnouts/squealing tires, which is illegal around here.)
-Must be able to handle long drives at 60mph+
-Must be reliable with only standard maintenance, like oil changes, etc
 

·
Registered
Joined
·
10,854 Posts
This is all VERY subjective,

My dad had a Cadilac in the 60's which was all OEM and had over 12/1 compression. It certainly wasn't considered a race engine. The guy next door had an Oldsmobile with 11.5/1 compression which had a 2 barrel; not a race engine in my book.
For a while I had a 1969 L-88 Corvette with over 12/1 compression and a factory original solid lifter camshaft with more duration than 260°/270°@.050" and it had over 80,000 street miles when I sold it.

I also see race cars which have rather mundane engines and NEVER run a mile on the street but, they certainly aren't considered to have street engines.

Personally, I think it is merely the intent of how it's built, how close all the tollerances are ... along with the necessity and schedule of expections it has to be maintained.

Definately, not the same defination for everyone.
 

·
Premium Member
Joined
·
5,231 Posts
Define legally Lem, because my state actually has a hp limit on street driven vehicles. There are plenty of street cars running around in excess of the max limit of 500hp up here but to my knowledge noone was ever forced to dyno there car either.:confused:;)

I do however know of that happening to a street racer in IL and the results were used against him to send him to jail with a huge fine also. The cops siezed his car used it as evidence against him in court then turned it into an undercover car used to bust more street racers.
 

·
Registered
Joined
·
412 Posts
WTF

Limit on hp on the street :eek: where does that put the KR500 Shelby its over 500hp from factory////.As far as the cops go doesn`t surprise me ***holes,, hell outa control here in tx either shooting some body unarmed,beating hell out of somebody on camera,dps slamming young girls into concrete bridges and busting their faces up or tasing some little old grandma on side of road. We even had a cop in san antonio had a nova that would pick races along as he didnt get beat alls good but got beat out came the cherry and u got a ticket.
 

·
Registered
Joined
·
63 Posts
We even had a cop in san antonio had a nova that would pick races along as he didnt get beat alls good but got beat out came the cherry and u got a ticket.
thats just a typical chevy guy for ya:D
everybody here has very good points, but IMO it just depends on how the car is built. for example my old mustang (408w carbed all motor) ran low tens, my friends mustang (331 FI supercharged) ran low tens also, but his was alot more street friendly. with todays technology anything is possible. ive also seen 8 sec. fuel injected big blocks run just fine on the street.
and when it comes to a "street car" being able to start in cold weather, how many of you have had trouble starting your vehicle in sub zero temps. i know my bone stock 92 f-150 barely wants to start sometimes when its really cold. and when it comes to that, i have to thank god for gear reduction starters!!
 
1 - 20 of 33 Posts
Top