R16 Horsepower Curiosity for Stroker and Race engines

[bossbob]

Just curious as to how much horsepower these engines can get. I was reading up on the Wiki page regarding the stroker engines but none of them mentioned horsepower.

So, what kind of power are the R16's capable of in either Race or Stroked form?

What would be a good number to shoot for?

[Curtis]

A good question. I have a stroked 5 main 1600. Stock HP is 96. Stock 2L with SU is 135. So I would guess it falls about in the middle of that. The big thing I noticed is the added torque in addition to the power, much better at hills. Be interesting to put it on the dyno when I have it back together.

My other car will get a stroked 3 main using the 1500 crank. That will give me about 1.8L making it a bit peppier and the numbers will match.

[TurboRagtop]

Curtis,
What displacement is your stroked 5-main 1600?

[Curtis]

2L, H20 crank.

[notoptoy]

Again, no numbers for HP, but I have an H20 bored 0.30 with a 9.0:1 compression ratio and an R16 head. This is a torque monster and there are times I think I could pull a house with it.
With a lightened flywheel it rev's responsible to, though it is no screamer like a U20. I really like the low end power.

[Tomc18]

I've got a H20 bottom end R16 with larger valves, mild cam, U20 carbs, etc It makes just under 130hp but feels quicker around town than a 175hp well built U20 on 44mm Solexes unless you are really using revs on the U20, because it makes so much torque down low. They have quite a different character

[Curtis]

Just under 130, I'd like to know about your valves and head.

[Gregs672000]

Crank or wheel...

[Datsunparts.comInc]

Interesting timing. I just posted in the vendors section Dave Rebello's stroker dyno numbers using one of our 1 5/8" tube diameter headers.

Dean

[Daryl Smith]

Thanks for posting that Dean.
Interesting that the 1 1/2" header was good for 180 hp......if I read that correctly....

Along with Dean's post, Lou in Australia has 2.3L strokers with posted 190 hp.

My reading, along with some airflow #'s suggest that 200 hp 'should' be attainable, but, will require a very well sorted engine/parts assembly...

[Pjackb]

Bob when you say “what’s a good number to shoot for” are you looking to build a street or race engine?

As you can see from Dean’s post a full race engine can make 180-185 hp (the difference between headers is marginal unless you race and live at the top End ) ,

Also as Daryl pointed out Lou Mondello Has built 190hp 2.3l R engines , what’s really special about these is that they are street-able engines running on 91 octane they use special long tubes headers and most develop Over 180lbs of torque most of it between 4K-6K rpm ( I have the specs somewhere I’ll look for them)

All that being said if you’re looking to build a good street stroker at a reasonable price and want to shoot for a number 130-140hp is a good target, if well built it will have lots of torque and feel much more powerful than an equivalent U20

I know Lou has built an R16 that has about 125hp but 190lbs of torque

[Datsunparts.comInc]

Bob when you say “what’s a good number to shoot for” are you looking to build a street or race engine?

As you can see from Dean’s post a full race engine can make 180-185 hp (the difference between headers is marginal unless you race and live at the top End ) ,

Also as Daryl pointed out Lou Mondello Has built 190hp 2.3l R engines , what’s really special about these is that they are street-able engines running on 91 octane they use special long tubes headers and most develop Over 180lbs of torque most of it between 4K-6K rpm ( I have the specs somewhere I’ll look for them)

All that being said if you’re looking to build a good street stroker at a reasonable price and want to shoot for a number 130-140hp is a good target, if well built it will have lots of torque and feel much more powerful than an equivalent U20

I know Lou has built an R16 that has about 125hp but 190lbs of torque

That report from Don tells the truth. Hey every little bit counts and 6 horsepower is nothing to shame on. We were often told by the experts that there is no increase in hp with the larger tube header. Dean

[JT68]

Suggest caution on interpretation of that dyno graph....

First off the displacement is noted as 350 with a 4.03 bore, so we know thats wrong. What else
is wrong and was the dyno even calibrated to any standard? Who knows? As wise man recently said to me "I can make a dyno dusplay just about anything I want"

We know it isn't an R16 at 1600cc if the measurements are even close to correct, so most likely 2.1 or beyond.

The max HP measurements of 180 and 186 are approching 8k, so of little practicality except for racetracks. In contrast Nissan provided measurements at 6k, which is far more useful for street use. So the 6k number matters a lot more unless this is a track engine.

Whats most apparent to me is that until over 7000 rpms, there is NO difference in torque between the two headers... less than 2% which is in the error band of the dyno. So with this engine there is no practical difference between the headers. Rebello proved that fairly effectively and Daryl picked up on it immediately.

And why would there be? The header design is essentially identical. Nothing is significantly different in either pipe configuration or the collector setup. As expected, 1 5/8 primaries start to matter near 8k. No practical difference for street cars.

Lastly, if you go pushing things to the bleeding edge, especially using budget components to make big displacements and try running around at 8k you will sacrifice much of the ruggedness and reliability these engines are known for. When you play on the bleeding edge a lot of times blood gets drawn....

[Pjackb]

That’s a definitely great engine with almost still 90% of its max torque at 7400 but it’s a full race engine probably running fairly high compression so what I’m saying is those very few Hp May make a difference but if Bob is not looking at building a full race engines and enjoys his car between 3-5K like most of us, according this graph he won’t see a difference

[Daryl Smith]

"I know Lou has built an R16 that has about 125hp but 190lbs of torque"

R16 is 97.3 cubic inches.
I'm quite sorry to say that this is highly questionable. Getting 2 hp per cubic inch is hard enough, naturally aspirated, to get near 2 ft/lbs per cubic inch is near, if not, impossible, especially from this engine.
(RPMxT)/5252 = hp

(3500x190)/5252 = 126.6 hp - That is assuming you are limited to 3500 rpm max. As soon as you exceed 3500 rpm, the HP increases....(145HP @4000)

While the math sorta works, the compression required would be in the high diesel territory, if then, not going to work with gasoline. jmo.