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1641cc or 1776cc

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hrastovica Officially Full-On Dubber

361 posts · joined Apr 2009 ·

#990322
Ok so i have just booked the bug in to get a new heart and agreed to getting the dual port reconditioned to 1641cc with a reputable local engine builder. In the meantime i have spoken to a friend (also a VW nut) who is suggesting to go the 1776cc, as the price of parts should be about the same and just a little extra boring for the larger barrels and pistons... without any loss in reliability or longevity.

Would love to hear your opinions on this...

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#990335
Machining costs AND compression ratio rectification are the only extra costs. Machining costs are $300-400, CR is to be advised by your engine builder, the easy (cheap) way is measure up and fit barrel spacers, sometimes this requires longer pushrods.
Something you may consider is a new 74 - 78mm stroker crank and keep the std or 87mm bore. No machining required, a crank is about the same cost as the machining and everything else is the same. 74x87 will give you a 1760cc engine that IMO will have plenty more torque with the extra stroke than the 69x90.5 1776cc engine. 76x87 = 1807cc Sounds good hey.... 🙂
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

empi Compulsive Aussie Vee Dubber

4,131 posts · joined Aug 2002 ·

#990342
I have new in box 90.5 pistons and barrels Dom!!
"If at first you don't succeed, skydiving is not for you." - Anonymous 🥷

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 ·

#990348
Are you planning on changing carbs or sticking with a 34 pict?

What about the cam?
Futue te ipsum!!!

hrastovica Officially Full-On Dubber

361 posts · joined Apr 2009 ·

#990386
Ok so the final verdict is in, i have decided to go down the path of 1776. Cam will be EngleW110 as per the engine builders recommendation, and a stock carb initially (I know its below spec but will have to do for a couple weeks/months til i sort out my $$$ to get some twin carbs on there).

Any suggestions on carbs for 1776? (Preferrably twin barrel twin carbs)...

Weber IDF36 or IDF40? Overkill?? Not?? Dellortos?

Open to suggestions here...

hrastovica Officially Full-On Dubber

361 posts · joined Apr 2009 ·

#990387
empi wrote:I have new in box 90.5 pistons and barrels Dom!!
Unfortunately too late as the car is already booked in and i think John has already organised all the parts...

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#990402
Weber or Dell 40's will be fine for that combo IMO
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 ·

#990622
matberry wrote:Machining costs AND compression ratio rectification are the only extra costs. Machining costs are $300-400, CR is to be advised by your engine builder, the easy (cheap) way is measure up and fit barrel spacers, sometimes this requires longer pushrods.
Something you may consider is a new 74 - 78mm stroker crank and keep the std or 87mm bore. No machining required, a crank is about the same cost as the machining and everything else is the same. 74x87 will give you a 1760cc engine that IMO will have plenty more torque with the extra stroke than the 69x90.5 1776cc engine. 76x87 = 1807cc Sounds good hey.... 🙂
I thought case clearancing was necessary for anything over 69mm stroke?

OP - I'd go a 1776 or better still Matts option. Makes for a much more driveable engine than the 1641.
madness is in the eye of the beholder 👍

modnrod Fahrvergnugen

978 posts · joined Mar 2011 ·

#990624
Stock carb isn't below spec, I've run high-15s on a Solex34. Just so you aren't too surprised though when it's running first up without dual 40s, a stocker carb with a 110 will idle with a "slight lump".........😀