Hi all
I think I will try to document my new engine build for the Capri, hopefully I can get some insights and help if I need it.
As some of you may know, I have been running turbo Pinto's in my MkII/III Capri since 1999 (I think). The first iteration was a standard high compression (9.2:1) Pinto, fitted with K-jetronic injection and a Mitsubishi 16T turbo. In an attempt to battle detonation I put together a low compression (8.2:1) bottom end using standard cast pistons (came from a Granada automatic Pinto but the same as Transit pistons). When I finally broke the ringlands on that (must have been 2006) I built a new bottom end using YB rods and pistons, and slapped on a Holset HX35 turbo. By then I had developed many things and also ran Megasquirt engine management.
That engine was used for some years and then the car had a body restoration between 2010 and 2014 or so. In Octobre 2015 the engine was dynoed at 280 whp and 400 Nm, at 1.8 bar of boost. But the very low compression ratio with the YB pistons meant that it was too lazy off-boost and spooled too slowly. During the summer of 2016 I decided to build a new bottom end with higher compression ratio.
The basic concept will be mostly the same but with more compression and hopefully a better flowing head to give a more responsive engine - not necessarily with more power than before.
Specification:
205 Pinto block
DP Pistons in 91,5 mm bore, 38 mm flat tops (should give me around 8.5:1 CR)
YB rods
RWD YB oil pump and spray bar
YB sump with wings, and trap doors
Pinto crank
TTV steel flywheel to take 240 mm YB clutch
Fluidampr front pulley, multirib
Head (not decided on carb or EFI casting yet) with slight port job
Paul Ivey/REC valves (REC 882 inlets 1.800”/45.7mm, REC 297 exhaust1.500”/38.0mm)
Kent FR34 camshaft
"Swedish plenum" intake, YB trumpets fixed to Pinto flange
Pulse split exhaust manifold
60 mm wastegate
Turbo will probably be the HX35 at least for now to see how it spools. I have the old Mitsubishi TD04-16T on the shelf but it might be a bit small - and I have a Mitsubishi 19T that I might try.
Right now I have cleaned up the block and it is basically ready to go for boring, but I will waint until I get the pistons (should be arriving the next days).
When I was at the SEMA show a couple of weeks ago I spoke to Cometic about an MLS gasket. I would like some opinions here - I have used standard YB gaskets earlier but with the 91.5 mm bore, I am a bit unsure. Cometic said they will do a special gasket for me, but what are the chances of an off the shelf 92.2 mm gasket surviving?
I'm hoping to be able to run at least 1,5 bar of boost. Management (ignition and fuel) will be MS3 as before, and the basic plan is to run regular petrol. May consider E85 if I need to but I'd rather avoid it.
Gustaf
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