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XNR's Hyper Pak 170 build
https://slantsix.org/forum/viewtopic.php?t=48168		 Page 1 of 2
Author:  Valleyant [ Sun Mar 11, 2012 10:15 pm ]
Post subject:  XNR's Hyper Pak 170 build
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!
Author:  Doc [ Mon Mar 12, 2012 9:20 am ]
Post subject: 
The 170 in the restored XNR seems to be a mild build... to factory specs and combined with a Comp 264 cam. ( I tried to talk them out of that cam but... :roll: :cry: )

That cam is better suited for smooth operation while "putting around" the show car field... not higher RPM performance.
DD
Author:  Valleyant [ Mon Mar 12, 2012 10:23 am ]
Post subject: 
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.
Author:  SlantSixDan [ Mon Mar 12, 2012 10:32 am ]
Post subject: 
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.
Author:  Valleyant [ Mon Mar 12, 2012 10:36 am ]
Post subject: 
Quote:
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!
Author:  Doc [ Mon Mar 12, 2012 11:02 am ]
Post subject: 
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
Author:  Valleyant [ Mon Mar 12, 2012 11:29 am ]
Post subject: 
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/196 ... pt/1349285
Author:  Slanted Opinion [ Mon Mar 12, 2012 2:42 pm ]
Post subject: 
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
Author:  Old Car Scott [ Mon Mar 12, 2012 2:47 pm ]
Post subject: 
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!! 8)
Author:  Doc [ Mon Mar 12, 2012 3:20 pm ]
Post subject: 
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
Author:  Old Car Scott [ Tue Mar 13, 2012 9:58 am ]
Post subject: 
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?
Author:  Doctor Dodge [ Tue Mar 13, 2012 8:26 pm ]
Post subject: 
Quote:
...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
Author:  Dan-o [ Wed Mar 14, 2012 6:55 am ]
Post subject: 
You guys are the devil for putting these high spinning 170 ideas into our heads.
Author:  Doc [ Wed Mar 14, 2012 8:44 am ]
Post subject: 
:twisted: :twisted: :P :lol:
Yes... a high revving 170, stuffed into a super-light vehicle is a total "hoot" to drive.
The only real downside is cam selection... basically, where do you put the "power band" if you want to drive the vehicle on the street??
DD
Author:  Dart270 [ Wed Mar 14, 2012 11:10 am ]
Post subject: 
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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