good start ???

[Shubee2 (DSK)]

92x74 (1968cc) would be different. Lot's of those built back in the day

yes thinking about that displacement , what do you think about the NPR /deano 92mm kit , i've just buy an NOS set of those one

Hi Fabs I noticed the Box On your Pistons says 40 HP Only??  NPR/Deano did make 92's for a 40 Hp I think the Difference is the Wrist Pin Size or the Placement of the wrist pin hole in the Piston if so they wont fit a 1600 up Rod  Anyone Else know for sure?

[speedwell]

92x74 (1968cc) would be different. Lot's of those built back in the day

yes thinking about that displacement , what do you think about the NPR /deano 92mm kit , i've just buy an NOS set of those one

Hi Fabs I noticed the Box On your Pistons says 40 HP Only??  NPR/Deano did make 92's for a 40 Hp I think the Difference is the Wrist Pin Size or the Placement of the wrist pin hole in the Piston if so they wont fit a 1600 up Rod  Anyone Else know for sure?

gary ,the Pins are 20mm

[speedwell]

with that kind of fan shroud , the 48 touch the fanhousing is normal , i will use the 30 hp fan housing , and as it's describe in another tread to modify this one , and also the sheet steels cylinder , will be modify too, where the manifold goes on the heads


thx
fabs

Hi Fabs. it looks like your short manifolds are causing the carbs to touch the fanshroud. if you keep your carbs the way they are facing then i think it will be a real pain to set the mixture screws at the back.  but it looks from the photos that if you reverse the carbs then the float bowl and fuel banjo will get in the way....the 30 hp shroud does give you a lot more room....

hy max
 i will go with a 30hp fan shroud , and for reversing  the carbs it's iimpossible with those manifold same as  the dds , the mixture screw are inside with those , and i've watching  several pictures with those manifold , and all are the same

 
fabs

[63 ripper]

that's cool. i have never really looked at any period manifolds so something new learned there  
p.s i vote for 2007cc

[Diederick/DVK]

no off the shelf parts 
same issue here fabs, had a look this morning and a 30hp shroud gives some nice clearance.

[63 ripper]

no off the shelf parts 

quick ! hide the torkers 

[Diederick/DVK]

hehe

[Jim Ratto]

those NPR 92's leak down out of the box new. Nice to look @ but I wouldn't run them.

I'd suggest a 94 x 78 fabs, simple to build, fast, nobdy can "see" what size the motor is. use an OEM stale air 40HP fan housing, like Jim Edmiston's.

[speedwell]

but I wouldn't run them.

why
thx

OEM stale air 40HP fan housing, l

not the same as an 30hp there's a dog house isn the 40hp  jim 've a30hp with 40hp dog house

[Jim Ratto]

but I wouldn't run them.

why anobody here doesn't know how to say why

thx

they do not seal rings to wall very well. Use Mahle 94mm

[Zach Gomulka]

they do not seal rings to wall very well. Use Mahle 94mm

Why is that? Can it be corrected with a good hone/cross hatch? Or different rings? I've got a set of NOS Biral NPR 92's that I'm planning to use... someday

[speedwell]

to late jim , now i've buy them  i will use them , the engine will be for a street use ,and " may be" sometime on dragstrip

[Jim Ratto]

to late jim , now i've buy them  i will use them , the engine will be for a street use ,and " may be" sometime on dragstrip

sorry, bro, but they'd be better for a short lived drag motor, but not for a streeter you need long term power from. The cylinders do not stay round. MAYBE in a real mild, low-state-of-tune (read: low CR, generous overlap, low lift) motor they might live a bit.

Lots of horror stories from old days @ Buggy House about those. Big Frank tried giving me a set for my street car, I said "no thank you"

[xavier]

Is it true for all NPR kits? Or just 92's?
I was thinking of purchasing a set of 90's...
Thank you.
xavier

[danny gabbard]

Jim didnt they also make a thick wall 92 back in the day ? Or was it just low grade casting material from npr cylinders ?

[jimi323]

Good work fab...
i like your early berg linkage...mine is just ready to be paint..
and i'm tring to re-make the gene berg sticker..

ps i like your" performing paper heads" in photo

[speedwell]

 

[Carsten]

Mounting the IDA`s that way is no problem ! I used early short Berg manifolds and had to work only a little at the fanhousing... Any more questions... Just ask ;-)
Greets , Carsten

[kingsburgphil]

to late jim , now i've buy them  i will use them , the engine will be for a street use ,and " may be" sometime on dragstrip

sorry, bro, but they'd be better for a short lived drag motor, but not for a streeter you need long term power from. The cylinders do not stay round. MAYBE in a real mild, low-state-of-tune (read: low CR, generous overlap, low lift) motor they might live a bit.

Lots of horror stories from old days @ Buggy House about those. Big Frank tried giving me a set for my street car, I said "no thank you"

The ISS 92's were even worse, as I recall. If you wanted reliable
p&c then, you used 88's, the variety depended on your budget. 89's were reserved for the go fast guys and when 90's came out you went looking for a sponsor.

[Shubee2 (DSK)]

92x74 (1968cc) would be different. Lot's of those built back in the day

yes thinking about that displacement , what do you think about the NPR /deano 92mm kit , i've just buy an NOS set of those one

Hi Fabs I noticed the Box On your Pistons says 40 HP Only??  NPR/Deano did make 92's for a 40 Hp I think the Difference is the Wrist Pin Size or the Placement of the wrist pin hole in the Piston if so they wont fit a 1600 up Rod  Anyone Else know for sure?

Gary ,the Pins are 20mm

try the pin in a 1600 rod!!  I also Agree with Jim they are better Left On the Shelf, I would use a Cima or Mahle's and build something fast that will last why build something that know will puke oil  to start with add them to your collection  and use the good stuff you will be glad you did.

[speedwell]

are better Left On the Shelf,

don't want something to put on a shelf , i want something to put on my engine without future problems , no problem i will sell those one in a swap meet may be some one would add a nice set of npr on is shelf

[Jim Ratto]

cylinder wall to ring seal is one of the most important facotrs in a good motor, Fabs. Just trying to be helpful, like the blue Honda commercial guy.

[speedwell]

new parts for the future engine 

[speedwell]

what about  this displacement 2110 cc 
90.5 BORE 82 MM STROKE
CHEVY ROD JOURNALS
SCAT CHROMOLY 3/8" BOLTS
FOR THE STREET USE A 120 CAM LIKE BUNCH HAS
FOR A LITTLE MORE POWER USE A 130 CAM
8.5:1
40 X 35.5 VALVE SIZE
STOCK ROCKERS WITH 911S ADJUSTER SCREWS
DUAL VALVE SPRINGS
CRANK BY BUGPACK OR SCAT
TYPE 4 MAINS WITH BMW BEARINGS


THATS ALL FOR NOW

RON

[speedwell]

yesterday i checked my  48 ida n ad would like to know what kind of idle jet and other stuff there's into the carb

can some one describe me what parts is/name

sorry for my ignorance   .....

But I made the effort to look at every part, and to note the references of those one

this how my 48 where jetting when i 've buy them 10 years ago

[speedwell]

can we change those parts too 

[speedwell]

no one can help me to named the parts from the 48 ida
 

[speedwell]

i suppose that my idles are this

but what 're the mains and air correctors on this pictures 

thx for my education
 

[Brother Lovedub]

50ew - Pump jets

F9 emulsion tubes

175 mains

160 air correctors

50 f8 idles

120 Idle airs

Good exploded diagram here.....

http://www.dellorto.co.uk/editor/uploads/images/ida48.pdf

[Brother Lovedub]

Check your venturis as well, you'll see a number when you look down the throat of the intake - with your spec you should be running 37mm, anything bigger will run like a bugger