Dyno sheet thread

[Pjackb]

Why is it such a PITA to try and get actual dyno sheets for R/H/U engines on this site?

I know a lot of folks have dynoed their engine but trying to see the actual sheets is like pulling teeth . I would really appreciate it if the folks who have dynoed their engines (especially strokers)could post actual pictures of the sheets .

Don't get me wrong It's great to know you make xxx power at Y rpm but what I think would be more useful to folks like me that don't have access to multiple cars to test drive is to see how that power is delivered especially the torque curve.

I will copy all the ones i was able to find here So hopefully we can get a single thread where we can see all the sheets


@Alvin , do you still have Steven Bs sheet you had posted on page 5 of the dyno debate? It doesn't show anymore

@Gregg and Will I know you guys have dyno sheets of your U20s could you please repost them

[Pjackb]

For the non-believers, here is my Dynojet dyno sheet for my S13 SR20DE roadster:

http://www.datsuns.com/Tech/dyno/sr20de-roadster.gif



All that with 30+ mpg, and no drama...

Michael

[Pjackb]

U20 Solex B cam dyno graph.

[Pjackb]

I did a quick run with my 1500 (8600 original mile engine)on the dyno.
It has 67.8 hp at 5634rpm and 106 nm at 3251rpm.
It should be 85hp at 5600 and 127nm at 4000.
The problem is that the car is running too rich (a/f ratio 10:1) from 2000 until 6000 rpm.
When I get that right it will be arround 80hp I think.
Will try to get it done in a few weeks.
It's to hot now (80F)

[Pjackb]

Just bought this 1600 '66 which was already in the Netherlands for some years.
A California car, license plate 2SHW696 ('91 sticker).
Nice car for this summer.
Original engine with 80000 miles.
It still has 77hp without maintenance yet.
Drives very good!!

[Pjackb]

North Vancouver's Scott Delaney's U20 2000 has the following:

1.00 mm over pitons
solex B cam
ported and polished
Crane high Six
MSD crank fire
1 1/2 inch header
2 1/4 inch exhaust

proof is in the pudding as they say and this is one very fast 2000

When Dieter Cramer went for a spin, his exact words were;" I did not know a U20 could go this fast".

please excuse the coffee stained, scribbled on dyno sheet, but here it is. 127.2 hp at the rear wheels

[Pjackb]

here is a dyno sheet off of my 66 with a S15 SR20DE earlier this year:



144 RWHP, 132 ft. lbs. of torque.

All stock, turn key, runs clean out the pipe with a catalytic converter.

Michael

[Pjackb]

So I did a dyno for the first time. This is with my su's non smog needle(ebay), 1 5/8 header with 2" exhaust. Bored .060 and A cam.
Max was 100hp with 113 torque! The carbs definitely need fiddling, but I've been neglecting them since buying the mikunis. I blame the weird curves on the carb needle and low dashpot oil (ok, Maybe some tuning needed). I'd love to do a tune up and do it again but this will be my "before" dyno

[Pjackb]

That crank hp, not whp.
195BHP U20

Though I didn't go this route, I met a several roadster owners who did. Dan Magliari being one of them, in his '69 SRL street car he built for himself and his wife to enjoy.
Hopefully he can chime in as his build was ~2005. I don't recall any "street manner" issues when he took me for a spin, and it moved well!

Everyone's perception of speed is relative, and our definitions of "Driveability" vary wildly!

[Pjackb]

If you have a 2000 it's a unique car so in my opinion keep the U20. A 2000 will in the long run maintain a higher price with a U20 than a sr20 or Ka etc. Others may disagree. Here is what Lou did for mine and this car is a dream to drive. Lou's rod and pistons cost about $800usd.

89.5X83 U20, LMDS Rods, KA 24 pistons, B cam, 10.25:1 Comp. Jack Mayes Short 4-1 extractors, Std head, 2 filters std base
Heenan & Froude Water brake engine dyno, Corrected figures for humidity and temperature.

RPM HP Ft/Lbs
3000 65 115
3500 85 127
4000 108 142
4500 124 145
5000 147 155
5500 153 146
6000 166 145
6500 171 138
6750 170 133

Longer Extractors and bit more fiddling to air filer system would have resulted in 175hp plus at the top end as well as waking up the bottom end.

This "std U20" Build is the common build in Aust, its the rods and pistons that do the trick, These parts are available to anybody all over the world.

[Pjackb]

Dave Rebello shared some numbers with me on his standard street build (200hp) and some of his light racing engines are making well over 225hp, not sure I can share details of what the build has thought

[2mAn]

Awesome! I think I have a few that I saved somewhere

[Pjackb]

From Lou Mondello

Jacques, in the U20 case, With a B cam, 44 PHH mIkunis, 37 chokes a decent set of extractors, 10.25-10.5:1 comp all the engines with this spec have made between 171-175 hp with 155-158 ft/lbs


Datsun U20, Lou Mondello Engine, 152mm Rods, Compression 10.4:1,.Mikuni 44's, Road/Club weekend racer, B cam, 67 1/2 Air box, 2 paper air cleaner elements. Mixtures .84-.90L
Heenan & Froude water brake Engine Dyno. All figures corrected for humidity and barometric pressure

RPM -----------BHP(1)----------BHP(2)---------- BHP(3)
3000 ------------63 ------------ 63 ---------------77
3500 ------------91 ------------ 91 ------------ 91
4000 ----------111 ------------ 111 ------------ 111
4500 ---------- 123------------ 123 ------------ 133
5000------------147 ----------- 147 ------------ 150
5500------------155 ----------- 159 ------------ 163
6000------------166 ------------ 169------------ 175
6500------------170 ------------ 175 ------------ 180
7000 -----------171 ------------177 ------------ 180


(1) As engine came in as described up top 37 chokes
(2) Change to 40 mm chokes, rest remained the same
(3) Long 32 inch 1 5/8 equal length extractors with 40mm chokes.

Interesting to note that at 3000 rpm the engine was making 133ftlbs with long pipes and did not loose out to the short pipes anywhere. Max torque was 158ft/lbs at 5000 rpm.

[Pjackb]

A few dyno run videos
[youtube][/youtube]


Alvin's SR20
[youtube][/youtube]

Reidus and Cleitus R16
[youtube][/youtube]

[youtube][/youtube]

one of Lou Mondello's U20
[youtube][/youtube]

[vorpal]

Here's my U-20 PHH44 Solex 1969:


Brought it from sea level to 2200'... was running out of breath at 5000 RPM...

A little jet fettling:



And a healthy gain... first base run in blue, final tuned run in red: