Stroker Poll

Tech tips and how to's

Moderators: notoptoy, garth, S Allen

Any interest in gathering stroker data to share with all?

Yes, I will submit information soon.
30
65%
Maybe, let me get back to you.
14
30%
Naw, a big waste of time-move on.
2
4%
 
Total votes: 46

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shifty
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Re: Stroker Poll

Post by shifty » Mon May 28, 2012 8:07 pm

Nothing wrong with an H20 - I like mine!
Leigh Brooks

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Latest post: http://www.shiftco.com/radios/the-test-mule/

67.5 SRL-00139 sleeping
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67.5 SPL-13622 - H20 PWR!

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dbrick
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Re: Stroker Poll

Post by dbrick » Mon May 28, 2012 8:13 pm

spl310 wrote:Not evil at all to use an H20 block. Of course, that would mean it is not a stroker...
Just bored?

Edit:
Steve, there was a posting of a full size template to tape on the piston and cut clearance in the R16 piston skirt, As Sid mentions below, it's in the Bob Sharp manual.
Last edited by dbrick on Mon May 28, 2012 10:04 pm, edited 1 time in total.

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spl310
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Re: Stroker Poll

Post by spl310 » Mon May 28, 2012 9:56 pm

Not the wiki, the Bob Sharp Manual that is available on datsun.org
"Wow, a Roadster!" Stuart Little

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Poobah
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Re: Stroker Poll

Post by Poobah » Tue May 29, 2012 12:03 am

Thanks for the info. I read Bob Sharp's Competion Manual and the use of R-16 pistons. I am concerned about 12+ to 1 compression. I would like to end up with a driver, not necessarily a full blown racing engine. My current R16 has been punched .30 over and was rebuilt in 1998. Prior to my purchase, it was last registered by a dead guy in 2001. So there is probably very little wear on the internals. I'm just thinking that 12+ to 1 compression ratio is too much for the crappy gas I buy at the SAFEWAY.
What is the volume of an r16 Aluminum head?
What is the volume of the U20 flat top piston?
What is the volume of the H20 dished piston?
What is the Volume of the R16 domed pistion?

Thanks

Steve

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Daryl Smith
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Re: Stroker Poll

Post by Daryl Smith » Tue May 29, 2012 3:53 pm

What is the volume of an r16 Aluminum head?
Combustion chamber volume on 2 heads I measured ranged from 47 to 50 cc on each of them.
1) 46.7, 49.5, 50.0, 48.9
2) 47.0, 49.0, 49.7, 47.3

What is the volume of the U20 flat top piston?
Flat top piston. Volume is 0.00 cc.

What is the volume of the H20 dished piston?
????

What is the Volume of the R16 domed pistion?
Working backwards with all other info an online calculator, I remember it being somewhere near 6cc.

To accurately calculate what your compression ratio will be you ned to know what your deck clearance will be. Stock parts and block will likely leave you below deck height by a significant amount. Taking .010" - .040" off the block deck can significanly raise your compression.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...
http://www.311s.org/registry/1966/spl311-01605.html

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Daryl Smith
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Re: Stroker Poll

Post by Daryl Smith » Tue May 29, 2012 7:41 pm

I think the 12:1 compression is for the U20, I didn't see any mention in the comp prep manual using a stroker crank and stock 1600 pistons in the R16. If it was otherwise stock what do you get.......

Using a piston volume of 10cc (probably closer than 6... :lol: ), below deck of .020"(?), and a gasket thickness of .050", cylinder head volume of 49cc, gasket bore of 3.49", with standard bore and stroke (3.433" x 2.63"), I get a compression ratio of 9:1. Increasing the stroke to 3.2678 brings it to....10.95:1... :smt017 Don't know what I did the other day that only made it 10:1......?????

Easy enough using the flat top pistons to get it into the 9.5 - 10:1 compression ratios, skim the head and or deck the block.........
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...
http://www.311s.org/registry/1966/spl311-01605.html

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Poobah
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Re: Stroker Poll

Post by Poobah » Thu May 31, 2012 12:42 am

Thanks Millions for the info. I think I will be using flat top U20 pistons. Depending on the cost of course.

Steve

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tjp
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Re: Stroker Poll

Post by tjp » Thu May 31, 2012 5:45 am

I seem to remember reading that the dished H20s are 5.6 cc.

tim
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ppeters914
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Re: Stroker Poll

Post by ppeters914 » Sun Jun 03, 2012 1:18 pm

Poobah wrote:Thanks Millions for the info. I think I will be using flat top U20 pistons. Depending on the cost of course.

Steve
Yeah, it may be worth it to have custom pistons made using modern materials and ring technology. That's what my machine shop guy and several others are saying.
Pete
-------------------------------------
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punkzdriver
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In a ball park range, what does a stroker build cost?

Post by punkzdriver » Mon Jul 01, 2013 9:03 pm

Due to ongoing problems over problems, I have to tear down my own engine (thats the short story) and have another engien relatively local that I can get my hands on. I am debating what to do next. On one hand, I would just like to drop another 1600 in and get the car running. On the other, if I have to tear down an engine, maybe its worth building a stroker??? I have a local friend that would help with the tear down and re-build. Plus, I got a lead on a brand new NISMO crank
Waiting for the bugs to be worked out...

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shifty
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Re: Stroker Poll

Post by shifty » Mon Jul 01, 2013 11:50 pm

Why not both? Drop the running engine in the car and rebuild the other at you leisure.
Leigh Brooks

http://www.shiftco.com - my blog about cars (and stuff)
Latest post: http://www.shiftco.com/radios/the-test-mule/

67.5 SRL-00139 sleeping
67.5 SPL-11481 suspended animation
67.5 SPL-12961 snoring
67.5 SPL-13622 - H20 PWR!

punkzdriver
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Re: Stroker Poll

Post by punkzdriver » Tue Jul 02, 2013 6:43 am

shifty wrote:Why not both? Drop the running engine in the car and rebuild the other at you leisure.

Im not sure of the cost of the build.

And, the one that has to come out may have head and/or block damage.
Waiting for the bugs to be worked out...

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Gregs672000
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Re: Stroker Poll

Post by Gregs672000 » Tue Jul 02, 2013 10:43 am

Time to do the R16 turbo! Was talking to my friend Steve the other day, giving him the stroke of the U20 so we could add that to our cam selection data. He got very excited when I told him the stroke of the R motors. He said with a bore and stroke like that you could build a very high reving, fast responding motor. Short stroke motors have some real advantages I gather.

BTW, custom pistons costs are going through the roof per Steve, so keep that in mind.
Greg Burrows
'67 2000 #588
Tacoma, WA

punkzdriver
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Re: Stroker Poll

Post by punkzdriver » Tue Jul 02, 2013 12:50 pm

Gregs672000 wrote:Time to do the R16 turbo! Was talking to my friend Steve the other day, giving him the stroke of the U20 so we could add that to our cam selection data. He got very excited when I told him the stroke of the R motors. He said with a bore and stroke like that you could build a very high reving, fast responding motor. Short stroke motors have some real advantages I gather.

BTW, custom pistons costs are going through the roof per Steve, so keep that in mind.

I was going to go NISMO stroker crank, and H20 pistons and rods.
Waiting for the bugs to be worked out...

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spl310
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Re: Stroker Poll

Post by spl310 » Wed Jul 03, 2013 10:54 am

If you need a 5 main block to play with, I have two in the garage...
"Wow, a Roadster!" Stuart Little

1967.5 2000
1967.5 2000
1964 1500
1964 1500
1967.5 1600
1968 chassis
2000 Durango
1995 F350 Powerstroke!
More...