TC88 heads on a TC96
#1
TC88 heads on a TC96
I had built a TC88 a couple of years ago to 95" for my Mukuni carbed FXDWG3, TW9BG roller woods cams, yada, yada. I had the TC88 heads ported, polished, CC'd heads, 3 angle seats, Manley stainless 1.94 valves, 1.6 exhaust, and springs. The combo made an awesome 113hp / 111 TQ. I decided to have another set of heads done with the same combustion chamber mods and install 2" intake valves and 1.6 exhaust....HP went up by 4, TQ by 2.
Now I have these "old" 1.94 TC88 heads that I have modified to accept the front upper motor mount for my fuel injected 08' FLHX for a 103 or 107 build.
Question, have the TC96 heads improved that much that I should have them reworked like the heads that I have or just freshen' up the TC88 heads and install them on my build? I'm not looking for the last ounce of HP or TQ for this build...looking for opinions and if I'm missing anything. Somewhere I read the intake flanges are different ?? Thanks guys.
Now I have these "old" 1.94 TC88 heads that I have modified to accept the front upper motor mount for my fuel injected 08' FLHX for a 103 or 107 build.
Question, have the TC96 heads improved that much that I should have them reworked like the heads that I have or just freshen' up the TC88 heads and install them on my build? I'm not looking for the last ounce of HP or TQ for this build...looking for opinions and if I'm missing anything. Somewhere I read the intake flanges are different ?? Thanks guys.
#2
The TC96 heads are an improvement over the TC88 heads but do not compare with a set of ported heads. TC88 heads will bolt on a TC96 and visa versa; no issues there. Compression is one issue you need to consider. The larger bore of a 103"/107" engine will increase compression and maybe more than you want/need. You need to know your chamber volume and run the compression calcs based on the cams you intend to run in the larger engine. You have some options but need to know the numbers.
If they will work, the other issue is the possibility of the larger intake valve kissing the top of the OEM flat top piston. The valve reliefs are for the smaller intake valve and with higher lift cams, it is possible for contact. The valve reliefs are deep enough but may need to be opened up and moved outboard. See the photos.
If they will work, the other issue is the possibility of the larger intake valve kissing the top of the OEM flat top piston. The valve reliefs are for the smaller intake valve and with higher lift cams, it is possible for contact. The valve reliefs are deep enough but may need to be opened up and moved outboard. See the photos.
#4
DJL, appreciate your reply. I will calculate the compression ratio, check clearances on the "new" pistons as I had done before on my other build. I realize the the modified TC88 head is much better than the "stock" TC96 head....my question is SHOULD I have the TC96 heads done like the TC88 heads that I have??? Is there any real numbers to gain that say most definitely or .....am I only going to gain 5 HP / TQ and invest $800 in another set of heads? My first thought is use what I have as they produced great numbers before.
#5
DJL, appreciate your reply. I will calculate the compression ratio, check clearances on the "new" pistons as I had done before on my other build. I realize the the modified TC88 head is much better than the "stock" TC96 head....my question is SHOULD I have the TC96 heads done like the TC88 heads that I have??? Is there any real numbers to gain that say most definitely or .....am I only going to gain 5 HP / TQ and invest $800 in another set of heads? My first thought is use what I have as they produced great numbers before.
#6
Once the headwork is established, there is not a difference, on the intake side here.
We do, however, create a "raised floor" exhaust port on the early heads, that does pick that up a bit, vs the later casting port.
Scott
We do, however, create a "raised floor" exhaust port on the early heads, that does pick that up a bit, vs the later casting port.
Scott
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HILLSIDE MOTORCYCLE & MACHINE, INC.
HARLEY-DAVIDSON SPEED & SERVICE CENTER
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
Sales/Support 315-495-6650
www.hillsidecycle.com
Walk-in Retail Showroom
Complete H-D Machine Shop
Case & cylinder boring
Complete Cylinder Head Shop
High-Performance Engine Kits
Crank Rebuilding
Direct Link & PowerVision Tuning
Goodson HD Tooling Manufacturer
Maxton Mile World Record
4500 sq ft. facility
OVER 35 YEARS OF H-D ENGINE BUILDING.
See us on Facebook.
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