Datsun Roadster Forum-311s.org

Very impressive numbers!

Gregs672000 wrote: Fri Jun 17, 2022 10:39 pm Ah, wait a minute here... why isn't everyone going freakin crazy over those wheel torque and HP numbers... are you kidding me!?! What a great result! The torque is awesome, and your HP number would have been higher if the engine could rev higher (pushrod vs OHC), but who cares... the torque is great. I guess I had forgotten this was a Rebello built 2150 stroker, and obviously he got it right.

Ha! I love this comment... and I guess I should have high-fived those numbers first and foremost, but I had some early intel on this because my engine is Funkaholik's little brother. I'm pretty sure these numbers are going up with some carb adjustments/changes.

An aside... I recall some side-eyed comments about the early dyno numbers on this engine - because "you can make a dyno say anything"...

Now we have a chassis dyno – by a different outfit - showing amazing numbers... this should be the proof in the pudding that Dave Rebello builds an awesome stroker.

Congrats, and I'm looking forward to you perfecting your setup!!! So close.

pm

At the wheel =
149 (++!) HP
152 (++!) Torque

Thanks, Peter. Next time we meet up - burnouts for distance!

Here is a pic of the 350mm wheel with my old stock wheel behind it, for perspective. It's amazing what a difference two inches makes.

Agree with your comments Peter. We have a real world example of crank vs wheel HP too, very helpful. I would like to see the full graph sometime so we can get an idea of where the cam works etc., but it doesn't appear this is likely a "peaky" engine but instead has a nice, long and strong torque curve. With 152 torque, at 6500 it's 188 wheel HP, at 7000 is 202.5! That gives you a ballpark comparison to a U20... and blows the doors off it. The difference will be pushrod vs OHC and the ability for the R head and intake to flow beyond 6000. But since you don't drive much at 6500rpm, it's the torque baby... that's why I want to see the full graph.

I hope to be on the rollers in July. If I get numbers like that I will be extremely happy. Congrats gentlemen... clearly money and time well spent!

funkaholik wrote: Sun Jun 19, 2022 11:57 pm Thanks, Peter. Next time we meet up - burnouts for distance!

Ha! Awesome, I've only done a few in all my years. That was in my L20B-powered 510... and was a zillion years ago, so I can't wait!

funkaholik wrote: Sun Jun 19, 2022 11:57 pm
Here is a pic of the 350mm wheel with my old stock wheel behind it, for perspective. It's amazing what a difference two inches makes.

https://flic.kr/p/2ntaZdu

Interesting and cool.

Gregs672000 wrote: Mon Jun 20, 2022 11:57 am Agree with your comments Peter. We have a real world example of crank vs wheel HP too, very helpful. I would like to see the full graph sometime so we can get an idea of where the cam works etc., but it doesn't appear this is likely a "peaky" engine but instead has a nice, long and strong torque curve. With 152 torque, at 6500 it's 188 wheel HP, at 7000 is 202.5! That gives you a ballpark comparison to a U20... and blows the doors off it. The difference will be pushrod vs OHC and the ability for the R head and intake to flow beyond 6000. But since you don't drive much at 6500rpm, it's the torque baby... that's why I want to see the full graph.

I hope to be on the rollers in July. If I get numbers like that I will be extremely happy. Congrats gentlemen... clearly money and time well spent!

Yes, I agree this is cool and interesting. Hopefully I'll be able to get mine on the Z Car Garage dyno as well... someday.

And it will be interesting to see Erik's next result with the adjustments he's making. More data. And good luck with yours Greg!

Greg, ask and you shall receive. This is the first run, which made the most power. Dialed back the timing a few degrees due to a little pinging at WOT, so subsequent runs made a little less power, but were much safer for the engine. This is also with smaller main and air jets than Rebello was running on the engine dyno. It made big top end power then, but was way too rich for the street.

Getting ready to drive Audrey up to Shasta - about a 4 hour trip. I loaded up tools, gloves, towels, extra oil & coolant, and anything else I thought I might need. Spare tire, jack, and lugwrench, of course.

My new steering wheel arrived last night, so I did what any car guy would do when prepping for a big road trip - frivolously changed my steering wheel at the last minute. I must admit that the Grant wheel is a bit more ergonomic, but I really love the look of this Renown Monaco Rosso wheel. It has a classic Momo Prototipo look, and the red stitching ties it together with the interior. Just like the Grant, it looks grey in this photo under fluorescent lights, but it is black.



Hope to meet some of you in person at the Shasta show. If you see my patina'd little beast, stop by and say hi.

funkaholik wrote: Mon Jun 20, 2022 4:20 pm Greg, ask and you shall receive. This is the first run, which made the most power. Dialed back the timing a few degrees due to a little pinging at WOT, so subsequent runs made a little less power, but were much safer for the engine. This is also with smaller main and air jets than Rebello was running on the engine dyno. It made big top end power then, but was way too rich for the street.

https://flic.kr/p/2ntmGWk

That's awesome, right?

funkaholik wrote: Thu Jun 23, 2022 2:00 pm My new steering wheel arrived last night, so I did what any car guy would do when prepping for a big road trip - frivolously changed my steering wheel at the last minute

That looks so good! More like the earlier steering wheels, really, really cool. Safe travels!

Ted's fun run this morning at Shasta. What a blast!

After the 4 plus hours drive to Shasta i have come to realize that Teresa is right - I need a quieter exhaust.

Ear plugs are easier to install

You are absolutely correct! Unfortunately, we were already both wearing earplugs, and had the top up. At 3500 rpm for 4 hours, it was just too much. Or maybe I'm getting old.

I also need to move redoing the seats up to the top of the list...

We used to call it ‘boat butt’ where your tail gets numb after a hour, after that there is no position you can seat in and take it anymore

What a great weekend! 610 miles traveled including the round trip to Mount Shasta, fun run, and driving around town. Everyone involved in putting together the Shasta show really gives it their all and makes it a fantastic couple of days. Even just driving around town is fun because you see so many other roadsters, which almost never happens in daily life. There were lots of unique cars there. I was really blown away by Pat's (dynaguy on 311s) car. 1969 Roadster with a flat dash swap, SR20 power, grey tweed interior, Volvo cupholders that slide out from the console lid, heated seats, and a mesh wind screen repurposed from a Miata behind the seats. Very slick.

Something shocking happened to me at the show on Saturday. A well-known Datsun expert, restorer, and parts guru came up to me and showed me his voting ballot, and under "Best of Show", he had written car 101 - my car! I honestly thought it was a joke at first, and didn't know what to say other than, "What?!?" He replied, "I love that car." A little while later, someone else told me that they had done the same thing - voted for my ratty car as best of show. Spoiler alert: No, I did not win best of show. That honor went to Chris Bennett and his immaculately restored 1964 1500. When I congratulated him that night on his win, he said, "I think it was really close between your car and mine. I'm serious." All of that is still really unfathomable to me. I did, however, win the Diamond in the Rough category, and that felt great. Lots of people seemed to enjoy the contrast between the restored engine bay and the heavy patina exterior.

Some photos:

End of the show.


Three ratty silver roadsters? Nope. The middle one is actually light metallic blue, but the Nevada sun has bleached all the pigment out.


Tim's "field find" 66 1600 with 69 sidemarkers and an H20.


Pat's interior.


Closeup of Pat's cupholders and heated seat switches.


Obligatory shot of my car with the mountain in the background.


First car show and first award!