1600cc Boxer options
Thought I'd start a new thread as there has been discussion in a couple of places about this, and the alternative way to go & the benefits of one of the other. I have cut and pasted info out of other threads to start off:
By Edward 1 Jan 09:
"Isn't there some odd option where you can put a 1700 crank in a 1500 block and end up with 1600cc. Could be the other way round I guess otherwise the pistons would push up too far..... Machine down the piston crowns? A 1500 crank in a 1700 block. Oh I don't know".
By Greek 1 Jan 09:
"1700 block with 1500 heads ....... Mech tappets also a plus".
By Sputnik 1 Jan 09:
"1500 crank with 1700 pistons gives you 1600".
By RSFruitbat 2 Jan 09:
"you can get 1600 either way, 1700 block and 1500 crank or 1700 crank and 1500 block.Both gve just under 1600cc.
I did the 1700 block and 1500 crank."
By Andy97 28 Sept 09:
"But which is the "best" option? No such thing I suppose as it epends on the intended application but what are the characteristics (Bhp/ability to rev/ torque) of one over the other?"
By RSFruitbat 28 Sept 09:
"I went the 1700 block and 1500 crank route. Engine produced about 97bhp at the wheels and would rev to 8k on balanced std internals with ARP rod bolts.
Cant remember torque figure"
And then there's Sprint 337's approach with a 1600 16v engine.
By Sprint337 Sept 09:
"1500 crank lightened, con rods lightened, titanium rod bolts, forged piston 87,0 mm, cams 293°/290°, 12,7/12 mm mm lift, big valves 34/30 mm, alloy valve spring plates, solid tappets, vernier cam pulleys, carbs Weber 44 IDF, csc exhaust manifold..."
By Greek Sept 09:
"did you use the crank of the 1.5 in the block of the 1.7 ?
with the piston rods of the 1.5 or 1.7 ?
pistons hight of the 16v or custom made to hight ?
Whats your compression ratio ?"
By Sprint337 Sept 09:
"Yes, 1500 crank ist used in 1700 block, with lightened 1500 rods. Piston height like 16V won“t work, because 4,8 mm less stroke with the 1500 crank, so you need 2,4 mm more compression height
CR is 11:1, much more is possible
16v crank with 1700 pistons means 1712 cc, but I need 1600 cc, because classes are 1300cc, 1600 cc, 2000 cc,..
Means with an 1700 cc engine you have to race against 2000 cc cars..
HP not enough to beat the 2000 cc cars (20 HP missing), enough to win the 1600 cc class.."
Please feel free to discuss further....!
Race an ex Works Toyota Carina in CSCC "Tin Tops" - endurance style racing for clubman.
Sold the Alfa 33 racer unfortunately!