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Can 948 SU carb fit into 1098? 948 diff with 1098 engine?

Posted: Fri Nov 27, 2009 11:39 am
by h20_mako
Can a 948 carb be fitted on a 1098? Will there be any issues? Originally is both the 948 and 1098 using the same carb?

If i were to fit a 1098 and ribbed gearbox, can the stock 948 diff still be used?

Cheers

Posted: Fri Nov 27, 2009 11:44 am
by PSL184
Can a 948 carb be fitted on a 1098? - Yes
Will there be any issues? - Can't think of any
Originally is both the 948 and 1098 using the same carb? - Both HS2 I think.
If i were to fit a 1098 and ribbed gearbox, can the stock 948 diff still be used? - Yes, although you may find it undergeared for motorways.

Posted: Fri Nov 27, 2009 11:54 am
by h20_mako
Thanks PSL you are saying undergeared would 50mph be considerably fine from your experience.

Posted: Fri Nov 27, 2009 12:12 pm
by PSL184
Yes 50mph would be OK but any faster you would find it gets very noisy :-)
Your acceleration would improve though ;-)

Posted: Fri Nov 27, 2009 3:32 pm
by mike.perry
The only difference with the carb is the 948 uses an M needle and the 1098 uses an AN needle.
The 1098 van and pickup are fitted with 948 diffs so there is no problem, it just gives better acceleration and a bit higher revs at the top end. Still good for 75mph+. From my observations of Singapore (2 days) you would not be too bothered about high speed cruising on motorways.

Posted: Fri Nov 27, 2009 9:42 pm
by andrew.searston
sorry to steel your post
but would it be the same for a 948 engine and gearbox with a 1098 diff, would you have to change the speedo????

Posted: Fri Nov 27, 2009 10:51 pm
by PSL184
andrew.searston wrote: would you have to change the speedo????
Yes, the change of diff ratio will effect the speedo reading.

Posted: Sat Nov 28, 2009 1:26 am
by mike.perry
It is wise to check the speedo against a sat nav. you would be surprised how optimistic the standard speedo is, so by changing the diff you may find that your speedo is fairly close.
With a 3.9 diff and larger tyres my 1098 1408 speedo is spot on.

Posted: Sat Nov 28, 2009 9:08 am
by h20_mako
only the diff will affect my speedo reading right? changing to a 1098 and ribbed gearbox will not affect the readings i currently have which is 1504 with 4.55 diff.

No worries andrew all here to learn :)

Mike 75mph+ is scary lol... my dad keeps telling me not to drive that fast and its the same logic as tell my granddad to run as fast as usian bolt..lolx... Mike when were you here in Singapore for the F1 race?

Posted: Sat Nov 28, 2009 10:45 am
by mike.perry
I was in Singapore in March for a stopover for a couple of days on the way to Australia

Posted: Sat Nov 28, 2009 4:18 pm
by h20_mako
oh i see. let me know when you drop by next time :) i can show you around

Posted: Sat Nov 28, 2009 11:28 pm
by mike.perry
Cheers, I will take you up on that when I visit my son in Australia next time.

Re: Can 948 SU carb fit into 1098? 948 diff with 1098 engine?

Posted: Tue Jun 29, 2010 12:57 pm
by h20_mako
For just a 1098 engine swap into my 1957 948 Tourer. Can i use the 948 gearbox and diff?

What i still need to include to complete the swap is the 1098 clutch, 1098 flywheel and HS2 carburettor?

Please advice?

Re: Can 948 SU carb fit into 1098? 948 diff with 1098 engine?

Posted: Tue Jun 29, 2010 5:15 pm
by bmcecosse
Just use ALL the 948 bits, including the backplate - on the 1098 block.