I believe that there are difference between early and late Sprint cylinder blocks. Can anyone outline what the differences are?
Thanks.
Sprint cylinder blocks
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GrahamFountain
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Re: Sprint cylinder blocks
According to a mate of mine, who really ought to know, early sprint blocks have a bit more chrome in the alloy they are cast from. But later castings are the same for both Doly and TR7. Don't know when the change was.PaulB wrote:I believe that there are difference between early and late Sprint cylinder blocks. Can anyone outline what the differences are?
Graham
The 16v Slant 4 engine is more fun than the 3.5 V8, because you mostly drive it on the upslope of the torque curve.
Factory 1977 TR7 Sprint FHC VVC 697S (Now all of, but still needs putting together)
B&Y 73 Dolomite Sprint UVB 274M (kids!)
1970 Maroon 13/60 Herald Convertable (wife's fun car).
Factory 1977 TR7 Sprint FHC VVC 697S (Now all of, but still needs putting together)
B&Y 73 Dolomite Sprint UVB 274M (kids!)
1970 Maroon 13/60 Herald Convertable (wife's fun car).
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Mad Mart
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Re: Sprint cylinder blocks
Cylinder blocks Graham, not heads.
Sprintless for the first time in 35+ years. 
... Still Sprintless.
Engines, Gearboxes, Overdrives etc. rebuilt. PM me.
2012 Porsche Boxster 981 S
... Still Sprintless.Engines, Gearboxes, Overdrives etc. rebuilt. PM me.
2012 Porsche Boxster 981 S
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GrahamFountain
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Re: Sprint cylinder blocks
No, I do mean the blocks. Cast iron is an alloy of iron and, mostly, carbon and sillicon. "Chromium is added in small amounts to the ladle to reduce free graphite, produce chill, and because it is a powerful carbide stabilizer" https://en.wikipedia.org/wiki/Cast_ironMad Mart wrote:Cylinder blocks Graham, not heads.
Graham
The 16v Slant 4 engine is more fun than the 3.5 V8, because you mostly drive it on the upslope of the torque curve.
Factory 1977 TR7 Sprint FHC VVC 697S (Now all of, but still needs putting together)
B&Y 73 Dolomite Sprint UVB 274M (kids!)
1970 Maroon 13/60 Herald Convertable (wife's fun car).
Factory 1977 TR7 Sprint FHC VVC 697S (Now all of, but still needs putting together)
B&Y 73 Dolomite Sprint UVB 274M (kids!)
1970 Maroon 13/60 Herald Convertable (wife's fun car).
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Jon Tilson
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Re: Sprint cylinder blocks
Was going to come to your defence there but see you've done it yourself....
Bit of Molybdenum goes in too IIRC.
Early ones also have cross drilled cranks - but you all knew that.
Jonners
Bit of Molybdenum goes in too IIRC.
Early ones also have cross drilled cranks - but you all knew that.
Jonners
Note from Admin: sadly Jon passed away in February 2018 but his humour and wealth of knowledge will be fondly remembered by all. RIP Jonners.
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GrahamFountain
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Re: Sprint cylinder blocks
Next time I talk to Nick, I'll see if he has more details on the alloyants, or a soure for the info.Jon Tilson wrote:Bit of Molybdenum goes in too IIRC.
Graham.
The 16v Slant 4 engine is more fun than the 3.5 V8, because you mostly drive it on the upslope of the torque curve.
Factory 1977 TR7 Sprint FHC VVC 697S (Now all of, but still needs putting together)
B&Y 73 Dolomite Sprint UVB 274M (kids!)
1970 Maroon 13/60 Herald Convertable (wife's fun car).
Factory 1977 TR7 Sprint FHC VVC 697S (Now all of, but still needs putting together)
B&Y 73 Dolomite Sprint UVB 274M (kids!)
1970 Maroon 13/60 Herald Convertable (wife's fun car).
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paulsprint
Re: Sprint cylinder blocks
Later blocks sprint,tr7 or 1850. Have bigger waterways around the pump and pos slightly bigger oil ways. The best block to use is a late but used 1850 block bored out to 2ltr.