Ok that's a good result, be good to compare mine when it's done eventually.
The 262 is unopened and running a set of the Factory 40mm carbs and the Fidanza flywheel. It makes 70rwkw.
1971 2T-B Celica TA22 ST.
1973 2T-G Celica TA22, aka "The Unicorn".
1975 2T-G Celica TA27 GT
1976 2T-G Celica TA23, aka "The Colonel".
1985 3F Auto FJ62 Landcruiser
1989 7M-GTE MA70 Supra, aka "The Poopra"
History: Rods Classic Celica Sampler thread.
Ok that's a good result, be good to compare mine when it's done eventually.
Daily - Prado 90series
Work - T908 620hp Cummins ISX
Shed - 1975 TA22 2TG
This rod ratio thing in this thread is confusing me.
The potential power of an engine lies within a certain boundary which is mainly defined by capacity and volumetric effiecency. I am really struggling to see that a rod ratio change will give power gains in the same region as upgrading the camshafts.
Taking a 2t with rod ratio of 1.75 (which according to most is close to optimal) and 3t with rod ratio of 1.58. We take the bore out on the 2t to 89mm(max) to get a capacity of 1742cc. The standard 3t capacity 1s 1770cc.
Lets assume all other variables influencing the volumetric efficiency(cr, cams etc) is the same as well as rotating mass.
Will the 2t due to its better rod ratio be a better engine??Will it make more power?....Or am I totally clueless?
It can be confusing to people who have never dealt with rod length/ stroke ratios. Basically the angle between the rod and bore is less with a longer rod which means piston is achieving more of a straight up and down motion rather than being pushed sideways, which a more acute angle creates. The basis is less sideways push less friction and less loss of energy at the mid stroke point, means a freer revving engine and very minor increase in torque. Hope this helps.
Nope it doesn't help...
The longer rod has less torque but can rev higher.
The shorter rod has more torque and does not rev as high.
There is such a small bees d!<# between option A and option B that on every forum you care to read there is great argument as to which has greater merit.
As a side note the engine masters challenge has been won for the last few years by short rod engines. This does not prove ultimate superiority either...![]()
Cheers,
Jason
3TC Compound Turbo 1976 TA23 - Members Ride Thread HERE
479RWHP on 50psi and 70psi hasn't broken her at the track!
those must have cost a pretty penny!
nice, is this for the 3tg you were building with the 84mm crank? what are the specs on the pistons? Rods are same as 2tg just 14mm longer?
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