I'd always been planning some sort of further engine upgrade and when my better half started complaining about our rate of ascent up the hills of Devon and Cornwall, I took that as approval for going ahead with it
. Initially I was going to get my existing 1600 Mexican upgraded with 90.5 B&Ps and full flow oil and run a 1776cc along with all of the existing setup.
I spoke to various people, one of whom was Dan Simpson, and after a second chat with him I decided I would slowly amass the parts for an all-new motor which Dan would put together and I could leave the van on the road with the existing 1600 until it came time to build up with the ancillaries. This would also allow for balancing of the crank assembly and the addition of a few more choice components.
I agonised over capacity for ages, as I was going for new case and crank etc. then a longer stroke seemed to make sense, but did I stick with the standard B&Ps or increase those as well, as I was going to do with the 1776? I read all sorts of info about wall thicknesses and the characteristics of bore vs stroke. There is so much info around, but sometimes too much, and trying to separate one person's point of view from fact ends up sending you a bit crazy. Anyway, although the initial temptation was to go 90.5 x 78 for 2007cc, I decided to reign it in a bit and went for a more subtle 90.5 x 74 for 1903cc, with some reasonable heads and a cam which favoured low-down torque over top end power.
The spec of the engine ended up being:
- Autolinea SuperCase with full flow
- CB Performance 1.5L deep sump
- DPR Counterweighted 74mm Crank
- Std weight flywheel 8 dowelled
- Kennedy Stage 1 clutch
- All dynamically balanced
- Scat 5.4" H-Beam Rods
- Mahle 90.5 forged barrels and pistons
- Engle FK41 cam
- CB Performance straight cut cam gear
- Scat Pro Comp 1.4:1 rockers
- Jaycee sprung Pushrod tubes
- CB 044 Super Mag CNC ported heads (40x35.5)
- Gene Berg 26mm Oil pump and cover
- Gene Berg breather tower
- Vintage Speed Sport Exhaust
- Dellorto DRLA 36's
- CB Performance manifolds match ported
- 123 Ignition vacuum distributor
Some of these parts were difficult to acquire, the Gene Berg stuff I managed to get delivered to a friend in Florida and picked up whilst on holiday there. A lot of the other stuff came via RJ Volks Performance and VW Performance Imports, whilst the carbs, dissy and exhaust were running on the 1600. The engine was built by the end of the year and come January 2015 was in the back of a borrowed Passat estate heading from Kent back to Dorset.
A few pics of the build:
The old engine coming out: