Aussieveedubbers 路 Tech Talk

1641cc or 1776cc

https://forums.aussieveedubbers.com/threads/105982/1641cc-or-1776cc

hrastovica 路

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 路

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.... 馃檪

empi 路

I have new in box 90.5 pistons and barrels Dom!!

Bizarre 路

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

What about the cam?

hrastovica 路

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 路

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 路

Weber or Dell 40's will be fine for that combo IMO

psimitar 路

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.... 馃檪
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.

modnrod 路

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".........馃榾