Skip to main content

Closed13 replies

proper jetting for dual 44 idf motor

A ashcreek
I just rebuilt a motor that came in a intermeccanica speedster.I am a 356 owner and restorer.
The motor was frozen with water damage.It has a 78m.m. stroker crank and 90.5 m.m.
pistons.The heads are ported with big valves.The motor had 88m.m pistons when I found
it but I was unable to find a new set.I bored it to accept the larger pistons and rebuilt the bottom end.When I started it up it seems to stumble and pop when I blip the throttle.
I replaced one weber and rebuilt the other.I was wondering if anyone has some info about
rejetting or some other fix.Any help would be greatly appreciated.
Thanks
Original Post

Replies sorted oldest to newest

A ashcreek
I just rebuilt a motor that came in a intermeccanica speedster.I am a 356 owner and restorer.
The motor was frozen with water damage.It has a 78m.m. stroker crank and 90.5 m.m.
pistons.The heads are ported with big valves.The motor had 88m.m pistons when I found
it but I was unable to find a new set.I bored it to accept the larger pistons and rebuilt the bottom end.When I started it up it seems to stumble and pop when I blip the throttle.
I replaced one weber and rebuilt the other.I was wondering if anyone has some info about
rejetting or some other fix.Any help would be greatly appreciated.
Thanks
FM Former Member
There isn't that much difference between 88 and 90.5 at least enough to make it idle the way you're describing. Adjust the carburetors with a vacuum "snail" then adjust mixture screws and the linkage to ensure that both are opening correctly. Once it's running and doesn't stumble then you can play with the jets.

Where do you live as many members would volunteer their help in getting the engine running correctly.
Post Content
Remove This Ad

Membership Required

We're sorry. You must be signed in to continue. Sign In or Register
×
Are you sure you want to remove from your Block List?
×
Loading...
×
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
×
Link copied to your clipboard.
×

Access to this requires a premium membership.

Supporting Member

Please help keep us running!

Supporting members have donated about $4.00 a month ($49.00 US per year) paid annually.

  • Priority support
  • Removal of inter-page (between thread) advertisements.
  • Access to Build Manuals
  • Access to Knowledge Base
  • Access to Supporting Members events.
  • Access to Leveraged Group Buying from site Merchants.

AUTO RENEW: You membership will auto-renew after 12 months. If you prefer not to auto-renew, you can cancel your premium membership at any time and it will remain in effect until the end of the 12 months. To cancel, sign in at SpeedsterOwners.com and navigate to: (Your User Name)  > Premium Membership.

PLEASE NOTE: Your credit card will receive a charge from CROWDSTACK PAY, the payment processor, not SpeedsterOwners.com.

$49.00 per 12 Months (plus tax if applicable)
×