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Valleyant
EFI Slant 6
Joined: 13 Jul 2007
Posts: 440
Location: Cincinnati
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Post subject:
XNR's Hyper Pak 170 build
(Sun Mar 11, 2012 10:15 pm)
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| Curious to know if this info is available. Would love to know more about the engines internals and specs. I have a complete '61 170 tucked away from the down draft tube to the prestolite starter and would like to plan a future build...just need to persuade the keeper of the Hyper Pak induction and exhaust bits to part with them. Thanks for any/all info!
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Doc
Guru
Joined: 14 Oct 2002
Posts: 4978
Location: Working in Silicon Valley, USA
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Valleyant
EFI Slant 6
Joined: 13 Jul 2007
Posts: 440
Location: Cincinnati
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Post subject:
(Mon Mar 12, 2012 10:23 am)
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Thank-you Doc,
During the interview with Leno the owner states power north of 250HP and "built to nascar specs" and if I understood him correctly 9000RPM potential. The engine looks and sounds great nevertheless and fits the character of the XNR ideally.
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SlantSixDan
Board Sponsor & Contributor
Joined: 31 Oct 2002
Posts: 21883
Location: North America
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Post subject:
(Mon Mar 12, 2012 10:32 am)
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In a credibility contest between Doc ("pretty near stock mild build for putting around the show grounds") and the owner trying to impress Jay Leno ("NASCAR specs! Over 250 million billion horsepowers! More than 9,000 RPM! It'll boil the road in first gear!"), Doc wins with all six connecting rods tied behind his back._________________ 一期一会
By birth & parentage: US citizen, 2nd class
By choice: Canadian citizen, 1st class
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Valleyant
EFI Slant 6
Joined: 13 Jul 2007
Posts: 440
Location: Cincinnati
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Post subject:
(Mon Mar 12, 2012 10:36 am)
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| SlantSixDan wrote: | | In a credibility contest between Doc ("pretty near stock mild build for putting around the show grounds") and the owner trying to impress Jay Leno ("NASCAR specs! Over 250 million billion horsepowers! More than 9,000 RPM! It'll boil the road in first gear!"), Doc wins with all six connecting rods tied behind his back. |
Not one bit of doubt...I believe Doug!
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Doc
Guru
Joined: 14 Oct 2002
Posts: 4978
Location: Working in Silicon Valley, USA
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Post subject:
(Mon Mar 12, 2012 11:02 am)
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| Quote: | | ...During the interview with Leno the owner states power north of 250HP and "built to nascar specs" and if I understood him correctly 9000RPM potential. The engine looks and sounds great nevertheless and fits the character of the XNR ideally. |
Where did you see that interview, is it on the web? (I would love to see it)
And yes... a "purpose built" 170 can (and has) produced power and performance, at the stated NASCAR levels... but not the 170 currently in the restored XNR.
To be honest... the biggest problem I found with a 170 that spins over 7500 RPMs, on a regular basis... everything "rattles loose" so they need constant "re-tighting" attention.
DD
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Valleyant
EFI Slant 6
Joined: 13 Jul 2007
Posts: 440
Location: Cincinnati
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Post subject:
(Mon Mar 12, 2012 11:29 am)
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Doc,
If you go to Jay Leno's Garage website and choose videos you can find the XNR video. Jay also asks what chassis the XNR is and the owner replies that it is a modified Valiant chassis. Leno says his mom had a 60 Valiant. If you have any problems I will post the url not sure how to do a link. Try this http://www.jaylenosgarage.com/video/1960-plymouth-xnr-concept/1349285
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Slanted Opinion
Turbo EFI
Joined: 22 Feb 2005
Posts: 1089
Location: Maine
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Post subject:
(Mon Mar 12, 2012 2:42 pm)
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Aside from the owner's gross exagerations of the engine build, it's GREAT to see the XNR survived. There were a bunch of really cool show-circuit cars built by Chrysler... almost every one went to the crusher because they didn't meet govt regulations for safety, etc.
- Mac
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Old Car Scott
TBI Slant 6
Joined: 09 Jan 2004
Posts: 208
Location: Tracy, CA
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Post subject:
(Mon Mar 12, 2012 2:47 pm)
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Wait wait wait.... a 170 cube slant six can be built to see 7500+ rpm and live?
Does the cylinder head allow it to breath enough to utilize that kind of RPM?
I never heard of such insanity! Maybe I need to rebuild that 170 and dump it into a Model A or something!!  |
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Doc
Guru
Joined: 14 Oct 2002
Posts: 4978
Location: Working in Silicon Valley, USA
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Post subject:
(Mon Mar 12, 2012 3:20 pm)
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Errr... nothing new here, a properly built 170 SL6 is a real RPM monster that can make impressive H.P. and live to collect the trophies.
Chrysler did this in 1960 & 61, at Daytona.
So here is some math:
How many CFMs of air is needed to support a 90% VE 170 at 8,000 RPMs?
Answer: 354 CFM
OK, a "race ported" SL6 head is known to flow around 200 CFM (intake side) @ 27"
So... how much H.P. can that CFM make when "pumped" thru a 170?
Answer: "The HP for your Cylinder Head Flow of 200 CFM is 319.83 HP at 9,450.90 RPM for your engine size of 170 CID" (Wallace Racing Calculator)
Bottomline: It is pretty easy to make a 170 spin and make good power. It is not real easy to keep all the bolts tight when doing so.
DD
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Old Car Scott
TBI Slant 6
Joined: 09 Jan 2004
Posts: 208
Location: Tracy, CA
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Post subject:
(Tue Mar 13, 2012 9:58 am)
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That is pretty cool. Learned something new about the slant six and now I'm thinking I may have to build a screaming 170 for my econo-beater.
Have you thought about cross drilling and safety wiring the fasteners to keep them from loosening? |
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Doctor Dodge
Guru
Joined: 12 Oct 2002
Posts: 3188
Location: Sunnyvale, Calif.
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Post subject:
(Tue Mar 13, 2012 8:26 pm)
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| Old Car Scott wrote: | | ...Have you thought about cross drilling and safety wiring the fasteners to keep them from loosening? |
I will do that on the flywheel (or flexplate) to crank bolts, on the next high RPM 170 I build. Those are the only bolts that are a real PITA to get to, when they loosen-up.
DD
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Dan-o
TBI Slant 6
Joined: 11 May 2007
Posts: 160
Location: AZ
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Post subject:
(Wed Mar 14, 2012 6:55 am)
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| You guys are the devil for putting these high spinning 170 ideas into our heads.
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Doc
Guru
Joined: 14 Oct 2002
Posts: 4978
Location: Working in Silicon Valley, USA
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Dart270
Board Sponsor & Moderator
Joined: 21 Oct 2002
Posts: 9609
Location: Blacksburg, VA
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Post subject:
(Wed Mar 14, 2012 11:10 am)
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I'm not afraid of RPMs on a street car...
Once I get my current motors in cars and running, I'll be building a bored 170 or a 170 stroker (198 crank) for at least 7000 RPM running. Will be interesting to try out. Maybe turbo, but probably start with NA.
Lou
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